{"id":20999,"date":"2026-02-25T08:00:11","date_gmt":"2026-02-25T14:00:11","guid":{"rendered":"https:\/\/ulprospector.ul.com\/?p=20999"},"modified":"2026-02-25T07:46:39","modified_gmt":"2026-02-25T13:46:39","slug":"pc-color-drenching-in-coatings-formulation-strategies-for-achieving-deep-uniform-saturation","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/20999\/pc-color-drenching-in-coatings-formulation-strategies-for-achieving-deep-uniform-saturation\/","title":{"rendered":"Color Drenching in Coatings: Formulation Strategies for Achieving Deep, Uniform Saturation"},"content":{"rendered":"

by R<\/a>onald Lewarchik<\/a> & Vishakha Makode<\/a><\/p>\n

\"\"<\/p>\n

Color drenching<\/strong> is a design style where the entire room surfaces including walls ceiling trim, doors, built-ins and furniture is painted in the same color or very similar shades to provide the impression of cohesiveness. The resulting appearance also creates the impression that the resulting space is larger and taller. Color drenching is not simply a matter of selecting a bold shade and applying it to every surface. Achieving a truly deep, uniform, and visually rich color across walls, ceilings, furniture, or metal substrates depends on how the coating is formulated and how the dried film interacts with light. Factors such as pigment type and concentration, dispersion quality, ratio of pigment to binder, and how the film forms and levels all play a direct role in the final appearance. Small changes in any of these areas can shift a coating from looking dense and saturated to appearing flat, patchy, or muted.<\/p>\n

When coatings are applied to different substrates\u2014such as drywall, wood, or metal\u2014the formulation<\/a> must also accommodate differences in surface energy, absorption, porosity and texture. These variables influence how the film builds and how color is perceived. For this reason, color drenching requires careful control of raw materials, processing, and application conditions, not only in the laboratory but also during production and at the job site.<\/p>\n

Pigment Selection and Its Impact on Color Depth <\/strong><\/p>\n

Pigments absorb specific wavelengths of light, and the efficiency of this absorption determines how intense a color appears. For drenching applications, pigments must provide high tint strength<\/strong><\/a> (the ability of a colorant to alter the color of another paint or substance) while remaining stable and well dispersed throughout the coating matrix.<\/p>\n

Organic pigments are typically favored for saturated systems because they provide cleaner hues<\/strong><\/a> (color and shade) and stronger chroma<\/strong><\/a> (the intensity of color) than most inorganic pigments. This allows formulators to achieve deep color without excessive pigment loading, which helps maintain film smoothness and mechanical integrity. Inorganic pigments, while excellent for durability (i.e. light stability and heat stability), they tend to produce more muted colors and are more suitable for earth tones or pastel shades.<\/p>\n

However, organic pigments are more sensitive to dispersion quality. Their high surface area and surface energy make them prone to flocculation<\/strong><\/a> if dispersant selection or grind conditions are inadequate. When pigments flocculate, clusters form that scatter light rather than absorb it efficiently, reducing saturation and causing shade variability across the surface. Proper wetting and stabilization during the grind phase are therefore essential to preserve both tint strength and uniform appearance.<\/p>\n

\"\"
Fig. 1: Relationship between Primary Pigment Particles, Flocculation and Agglomeration SOURCE: MDPI.com<\/figcaption><\/figure>\n

Titanium dioxide and mineral extenders also influence color depth. Titanium dioxide is highly effective at scattering light, which improves hiding but reduces saturation by reflecting light before it reaches colored pigments. Even small additions can noticeably reduce chroma. Coarse extenders similarly increase internal scattering and reduce visual richness. In many drenching systems, these materials are minimized or excluded, and hiding is managed through substrate preparation or multiple coats rather than through high opacifier loading.<\/p>\n

Pigment Volume Concentration (PVC), CPVC, and Film Structure<\/strong><\/p>\n

Pigment loading must be evaluated not only by weight percent but also by volume fraction. This is captured by Pigment Volume Concentration<\/strong> (PVC), defined as the volume of pigment divided by the total volume of pigment plus binder in the dry film.<\/p>\n

As PVC increases, pigment particles move closer together and the binder available to fill the voids between particles decreases. At a formulation-specific point known as the Critical Pigment Volume Concentration (CPVC), the binder just fills all interstitial spaces. Above CPVC, air voids begin to form, increasing porosity and altering both optical and mechanical properties.<\/p>\n

\"\"
Figure 2 \u2014 Conceptual Film Morphology Below and Above CPVC<\/figcaption><\/figure>\n

Below CPVC, binder fully surrounds pigment particles, forming a continuous film. Near CPVC, pigment packing is dense, but voids are still filled. Above CPVC, insufficient binder leads to air voids, increasing paint film paint film porosity and light scattering. porosity and light scattering.<\/p>\n

\"\"
Figure 3 \u2013 Relationship Between PVC and Key Coating Properties<\/figcaption><\/figure>\n

As PVC increases toward the CPVC, pigment packing density increases and color depth improves due to greater light absorption within a continuous film. Beyond CPVC, insufficient binder leads to air void formation, increasing internal light scattering and reducing perceived color saturation, while permeability rises sharply as film porosity increases.<\/p>\n

Table 1 \u2014 PVC Regions and Visual Outcomes<\/strong><\/p>\n

\u00a0<\/strong><\/p>\n\n\n\n\n\n\n
PVC Region<\/strong><\/td>\nFilm Structure<\/strong><\/td>\nOptical Effect<\/strong><\/td>\nVisual Appearance<\/strong><\/td>\n<\/tr>\n
Low PVC (< CPVC)<\/strong><\/td>\nBinder-rich, dense film<\/td>\nLow scattering<\/td>\nSmooth surface, moderate saturation<\/td>\n<\/tr>\n
Near CPVC<\/strong><\/td>\nTightly packed pigment, minimal voids<\/td>\nHigh absorption, low scatter<\/td>\nDeepest saturation, uniform tone<\/td>\n<\/tr>\n
Above CPVC<\/strong><\/td>\nPorous, air-filled structure<\/td>\nHigh scattering<\/td>\nMatte or chalky, reduced depth<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/strong><\/p>\n

For color drenching, formulations are typically designed below or near CPVC, even when targeting matte finishes. Low sheen is achieved through surface texture control rather than pushing pigment loading into the porous regime.<\/p>\n

Binder Selection and Optical Clarity<\/strong><\/p>\n

The binder determines not only mechanical properties but also how light passes through the film. A transparent binder that forms a smooth, continuous layer enables more light to penetrate the film and interact with pigment particles before being reflected back to the observer.<\/p>\n

Acrylic binders are widely used because they offer good clarity, resistance to yellowing, and compatibility with organic pigments. Polyurethane-modified acrylics and self-crosslinking systems can further improve leveling and surface durability without introducing haze. These systems are useful when drenching is applied to trim, doors, furniture, or metal components that experience frequent contact.<\/p>\n

\n

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\n

Surfactant migration during drying can create subtle variations in surface chemistry and refractive index, leading to uneven sheen or slight shade shifts. This is more noticeable in saturated colors <\/strong>(very near the peak intensity or chroma), making surfactant control and additive compatibility important parts of formulation design.<\/p>\n

Dispersion Quality, Rheology, and Application Effects<\/strong><\/p>\n

Even when pigment and binder are properly selected and formulated at the proper levels, poor dispersion or flow behavior can reduce saturation. Incomplete dispersion leaves pigment agglomerates that scatter light and create localized shade differences which may also be the result of flooding or floating. Rheology<\/strong><\/a> (the study of the deformation and flow of matter that focuses on the relationships between stress, strain, temperature and time) influences how evenly the coating spreads and whether brush or roller marks remain visible after drying.<\/p>\n

Associative thickeners, flow modifiers, and leveling agents are used to balance sag resistance with smooth film formation. For large surfaces typical of drench applications, good leveling is critical to avoid lap marks that break visual continuity. Surface smoothness directly influences how uniformly light is reflected and\/or absorbed, which affects perceived color depth.<\/p>\n

Substrate Effects and Direct-to-Metal Applications<\/strong><\/p>\n

Substrate properties strongly affect color perception. Porous substrates can absorb binder unevenly, creating localized variations in pigment concentration and resulting in patchy or uneven appearance. Primers and sealers are often necessary to create uniform absorption and consistent surface energy before applying saturated topcoats.<\/p>\n

When color drenching is applied to metal surfaces such as architectural features, railings, doors, or furniture \u2014adhesion and corrosion resistance must also be considered along with appearance. In these cases, formulation principles from Direct-to-Metal (DTM) coatings become especially relevant. Resin selection, surface wetting, and pigment\u2013binder balance must support both strong adhesion and consistent color development in a single coating layer.<\/p>\n

Recent advances in DTM resin chemistry emphasize achieving durable adhesion, corrosion protection, and environmental compliance without the use of separate primers. These same principles including dispersion stability, film continuity, rheology and PVC optimization are equally important when saturated color is required on metal substrates. For a more detailed discussion of DTM resin chemistry, adhesion mechanisms, and performance trade-offs, refer to our recently published article on Direct-to-Metal coatings, \u201cDirect-to-Metal Coatings: Evolving Chemistry, Elevated Performance, and Enhanced Sustainability<\/a>,\u201d<\/p>\n

Durability Considerations in High-Chroma Coatings<\/strong><\/p>\n

Highly saturated coatings can be more sensitive to burnishing, abrasion, and surface marking, especially when formulated near CPVC with limited extender content. Increasing binder content, selecting tougher polymer backbones, or incorporating mild crosslinking can improve scrub resistance.<\/p>\n

However, excessive hardness contributed to pigment loading can increase light scattering and reduce saturation. Achieving both durability and color depth requires balancing binder strength with optical clarity rather than relying solely on pigment loading.<\/p>\n

Conclusion<\/strong><\/p>\n

Color drenching places greater demands on formulation than conventional decorative coatings. Deep, uniform color depends on careful pigment selection, high-quality dispersion, precise control of PVC relative to CPVC, and binder systems that support smooth, continuous film formation. Substrate interactions and durability requirements further complicate the design process, particularly when coatings are applied to metal or high-wear surfaces<\/p>\n

 <\/p>\n

References<\/strong><\/p>\n

    \n
  1. Critical Pigment Volume Concentration (CPVC)..
    \n    https:\/\/www.sciencedirect.com\/topics\/engineering\/critical-pigment-volume-concentration<\/a><\/li>\n
  2. Lewarchik Effect of Pigment Volume Concentration on Coatings & Properties. https:\/\/www.ulprospector.com\/knowledge\/795\/pc-pigment-volume-concentration-part-ii\/<\/u><\/li>\n
  3. Lewarchik Pigment Volume Concentration (PVC) in Coatings.
    \n    https:\/\/www.sciencedirect.com\/topics\/engineering\/pigment-volume-concentration<\/a><\/li>\n
  4. Bierwagen, G. P. Film Formation and the Role of Pigment Packing in Coatings.<\/em>
    \nProgress in Organic Coatings, Elsevier.<\/li>\n
  5. Wicks, Z. W., Jones, F. N., Pappas, S. P., Wicks, D. A.
    \nOrganic Coatings: Science and Technology, 3rd Ed., Wiley.<\/li>\n
  6. lewarchik Dispersion and Wetting Hydrophobic Pigments and Fillers in Waterborne Apints to avoid Pigment Flooding and Floating Part II https:\/\/www.ulprospector.com\/knowledge\/1579\/pc-hydrophobic-pigments-flooding-and-floating\/<\/u><\/li>\n
  7. Bentley, J. A. Optical Properties of Pigmented Coatings.<\/em>
    \nJournal of Coatings Technology and Research.<\/li>\n
  8. Just Paint (Golden Artist Colors).
    \nPigment Volume Concentration and Its Role in Color.<\/em>
    \n    https:\/\/justpaint.org\/pigment-volume-concentration-and-its-role-in-color\/<\/a><\/li>\n
  9. PPG Industries.
    \nUnderstanding Pigment Volume Concentration in Architectural Coatings.<\/em>
    \n    https:\/\/www.ppgpaints.com\/pro\/pro-painting-tips\/pigment-volume-concentration<\/a><\/li>\n
  10. Herbst, W., Hunger, K.
    \nIndustrial Organic Pigments: Production, Properties, Applications. Wiley-VCH.<\/li>\n
  11. Lewarchik, V. Makode,
    \nDirect-to-Metal Coatings: Evolving Chemistry, Elevated Performance, and Enhanced Sustainability. <\/em>    https:\/\/www.ulprospector.com\/en\/na\/knowledge\/knowledge-detail?knowledgeId=dtm-coatings-evolving-chemistry-performance-sustainability<\/a><\/li>\n<\/ol>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    by Ronald Lewarchik & Vishakha Makode Color drenching is a design style where the entire room surfaces including walls ceiling trim, doors, built-ins and furniture is painted in the same color or very similar shades to provide the impression of … 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Lewarchik, President and CEO of Chemical Dynamics, LLC, brings 40 years of paint and coatings industry expertise to his role as a contributing author with the Prospector Knowledge Center. As a contributing writer, Ron pens articles on topics relevant to formulators in the coatings industry. He also serves as a consultant for the Prospector materials search engine, advising on issues related to optimization and organization materials within the database. Ron's company, Chemical Dynamics, LLC (www.chemicaldynamics.net), is a full-service paint and coatings firm specializing in consulting and product development based in Plymouth, Michigan. Since 2004, he has provided consulting, product development, contract research, feasibility studies, failure mode analysis and more for a wide range of clients, as well as their suppliers, customers and coaters. He has also served as an Adjunct Research Professor at the Coatings Research Institute of Eastern Michigan University. As such, Ron was awarded a sub-grant from the Department of Energy to develop energy-saving coating technology for architectural applications, as well as grants from private industry to develop low energy cure, low VOC compliant coatings. He taught courses on color and application of automotive top coats, cathodic electro-coat and surface treatment. His experience includes coatings for automotive, coil, architectural, industrial and product finishing. Previously, Ron was the Vice President of Industrial Research and Technology, as well as the Global Director of Coil Coating Technology for BASF (Morton International). During his fourteen-year tenure with the company, he developed innovative coil coating commercial products primarily for roofing, residential, commercial and industrial building, as well as industrial and automotive applications. He was awarded fifteen patents for new resin and coating formulas. From 1974 to 1990, Ron held positions with Desoto, Inc. and PPG Industries. He was the winner of two R&D awards for coatings utilizing PVDF resins, developed the first commercial high solids automotive topcoat and was awarded 39 U.S. patents for a variety of novel technologies he developed. He holds a Masters in Physical Organic Chemistry from the University of Pittsburgh and subsequently studied Polymer Science at Carnegie Mellon University. Ron lives in Brighton, Michigan with his family. 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Lewarchik, President and CEO of Chemical Dynamics, LLC, brings 40 years of paint and coatings industry expertise to his role as a contributing author with the Prospector Knowledge Center. As a contributing writer, Ron pens articles on topics relevant to formulators in the coatings industry. He also serves as a consultant for the Prospector materials search engine, advising on issues related to optimization and organization materials within the database. Ron's company, Chemical Dynamics, LLC (www.chemicaldynamics.net), is a full-service paint and coatings firm specializing in consulting and product development based in Plymouth, Michigan. Since 2004, he has provided consulting, product development, contract research, feasibility studies, failure mode analysis and more for a wide range of clients, as well as their suppliers, customers and coaters. He has also served as an Adjunct Research Professor at the Coatings Research Institute of Eastern Michigan University. As such, Ron was awarded a sub-grant from the Department of Energy to develop energy-saving coating technology for architectural applications, as well as grants from private industry to develop low energy cure, low VOC compliant coatings. He taught courses on color and application of automotive top coats, cathodic electro-coat and surface treatment. His experience includes coatings for automotive, coil, architectural, industrial and product finishing. Previously, Ron was the Vice President of Industrial Research and Technology, as well as the Global Director of Coil Coating Technology for BASF (Morton International). During his fourteen-year tenure with the company, he developed innovative coil coating commercial products primarily for roofing, residential, commercial and industrial building, as well as industrial and automotive applications. He was awarded fifteen patents for new resin and coating formulas. From 1974 to 1990, Ron held positions with Desoto, Inc. and PPG Industries. He was the winner of two R&D awards for coatings utilizing PVDF resins, developed the first commercial high solids automotive topcoat and was awarded 39 U.S. patents for a variety of novel technologies he developed. He holds a Masters in Physical Organic Chemistry from the University of Pittsburgh and subsequently studied Polymer Science at Carnegie Mellon University. Ron lives in Brighton, Michigan with his family. Contact Ron via email\u00a0or through his company\u2019s web site at www.chemicaldynamics.net to learn more about his consulting services\u2026","sameAs":["https:\/\/ulprospector.ul.com"],"url":"https:\/\/ulprospector.ul.com\/author\/ron-lewarchik\/"}]}},"authors":[{"term_id":1249,"user_id":12,"is_guest":0,"slug":"ron-lewarchik","display_name":"Ron Lewarchik","avatar_url":"https:\/\/ulprospector.ul.com\/media\/2014\/05\/Ron-Lewarchik_avatar_1399393591-96x96.png","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/20999","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/comments?post=20999"}],"version-history":[{"count":8,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/20999\/revisions"}],"predecessor-version":[{"id":21342,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/posts\/20999\/revisions\/21342"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media\/16638"}],"wp:attachment":[{"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/media?parent=20999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/categories?post=20999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/tags?post=20999"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/ulprospector.ul.com\/wp-json\/wp\/v2\/ppma_author?post=20999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}