Why can colors vary lot to lot

dye lot is a record taken during manufacturing ensuring the products received  coloration in the same vat at the same time. Paint and dye manufacturers assign each lot a unique identification number and stamp it on the label before shipping. Slight differences in temperature, dyeing time, and other factors can result in different shades of the same color between different dye lots of otherwise identical production. Although elements of a dye lot number kept by internal business record keeping, retail yarn and paint consumers have an interest in ensuring that they purchase a given color from identical dye lots.

PRL Resins has expertise of over 40 years perfecting their products, service and processes. They hold the go-to authority reputation regarding the sensitive nature of products made of resins, solvents and other industrial surfaces .


  • Resin holds together the pigment in suspension, provides surface adhesion and determines the quality and durability.


  • The pigment is in a powder form  much like concrete, and the average aftermarket automobile paint system includes about 100 colors or toners to mix formulas, including metallic and pearl colors.


  • The solvent provides transferability, as without solvent the paint would be too thick to transfer between containers.

Theory vs Chemical Reactions

The paint is mixed to exact specifications and all painting performed from that lot of paint will be exactly the same even after sunlight, drying and ultraviolet exposure. However, if the same formula is followed at another temperature or humidity on another day, that lot of paint can be a different shade and sometimes in some of the related colors such as blue-green, it can be another color altogether.  Therefore, lots are important and paint compound from one is not going to match perfectly when application is finished.

The same is true in fabrics, and yarn or fabric from the same dye lot is desirable in sufficient amount to complete an article of clothing.

Modern Technical Controls of PRL Resins

PRL Resins has conquered most inconsistency problems with expert handling of their resin that goes beyond that found in any other manufacturing company, and with their high UL certification. The industrial compound ingredients that permit

PRL Resins to manufacture products with truer color matches include:

  • Additives-
    • UV stability
    • Colorants
    • easy release by mold releases
    • other stability additives
  • Modifiers-
    • Impact Modifiers
    • Flame Retardants
    • Flow Enhancers
  • Reinforcing Agents-
    • Glass fibers
    • Mineral fillers

Revolutionary Data Color Spectrophotometer

Merging SPC with their integrated statistical process control ensures PRL Resins of precise color matching with their custom color control.

Precision color matching:

The continued reinvestment by PRL Resins back into their plastic resin technology, together with their staff of experienced color lab specialists, ensure precise color matching. A Data Color Spectrophotometer with integrated statistical process control SPC gives exact color matching capabilities and ensures lot-to-lot color consistency.This SPC control makes PRL a go-to authority in color and lot consistency.  It provides them with expertise to warranty their products fully and offer complete service support to their clients.