Pigments color stability

An organosol is the same mixture as described above, with the addition of solvent to reduce viscosity. These find their major applications in coatings. The solvent is evaporated before fusion of the film. Various pigments, colorants, stabilizers and fillers may be added, depending on the desired properties. Emulsion polymerization resins are generally employed because of their fast fusion rates. Coarser particle sized PVC resins would require extended time at the elevated temperature. 

FWWMR Finish. The abbreviation for fire, water, weather, and mildew resistance, FWWMR, has been used to describe treatment with a chlorinated organic metal oxide. Plasticizers, coloring pigments, fiUers, stabilizers, or fungicides usuaUy are added. However, hand, drape, flexibUity, and color of the fabric are more affected by this type of finish than by other flame retardants. Add-ons of up to 60% are required in many cases to obtain... 

The Atlas Type FDA-IR Fadeometer is used primarily to check and compare color stability. Besides determining the stability of various pigments needed to provide both standard and custom colors, the Fadeometer is helpful in preliminary studies of various stabilizers, dyes, and pigments compounded in plastics to prolong their useful life. 

BronUlard, R., The chemistry of anthocyanin pigments. 7. Origin of the exceptional color stability of the zebrina anthocyanin. Phytochemistry, 20, 143, 1981. 

The conversion of anthocyanins to the various pigments mentioned in the earlier sections increases the range of available colors. Moreover, substitutions of the C-ring as encountered in some of the derivatives impede nucleophilic addition of sulfite or water, thus increasing color stability. 

Except for the expensive cobalt green, chromium oxide is the only green pigment that meets the high color stability requirements for building materials based on lime and cement [3.69]. In plastics, however, chromium oxide green is only of minor importance because of its dull tint. 

Fastness. Fastness describes the characteristics of a pigment in terms of its color stability in a pigmented system upon exposure to light, weather, heat, solvents, or various chemical agents. Ideally, a pigment should be insoluble and chemically and photochemically inert. Only a few organic pigments approach such perfection. 

Color stability (pigments, organic dyes) (exposure). 

Aldehydes also affect the aging characteristics and color stability of wines. Reactions with SOj decrease the amount of free SOj available to act as an antioxidant during wine storage. Acetaldehyde in particular can catalyze the condensation of flavonoids to form polymeric pigments which directly affect the taste and color of red wines (2). 

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