Tint strength colorants

ASTM E20-843 for color strength in ink, and ISO 8781 (parts 1—3) for evaluating tinting strength, fineness of grind, and gloss. 

There are a number of ways to obtain color in a ceramic material (1). First, certain transition-metal ions can be melted into a glass or dispersed in a ceramic body when it is made. Although suitable for bulk ceramics, this method is rarely used in coatings because adequate tinting strength and purity of color caimot be obtained this way. 

Iron Oxides. In addition to the black iron oxide, there are several natural and synthetic yellow, brown, and red oxides. As a class, they provide inexpensive but dull, lightfast, chemically resistant, and nontoxic colors. The natural products ate known as ocher, sieima, umber, hematite, and limonite. These include varying amounts of several impurities in particular, the umbers contain manganese. Their use is limited because of low chroma, low tinting strength, and poor gloss retention. 

Lithol rubine is a second example of an azo dye and is important in printing inks. It is a brilliant color and has high tinting strength, good lightfastness, and solvent resistance. 

Cadmium pigments are mainly used to color plastics. They have brilliant, pure shades (yellow, orange, red, and bordeaux), good hiding power, and moderate tinting strength. 

The tinting strength is a measure of the ability of a carbon black to darken lighter-colored pigments. In accordance with DIN 53 204 and 53 234 (see Table 29), it is determined by blending the black and a white pigment with Unseed oil to form... 

Black concentrations of 0.5-2% are required for full-tone tinting. For crystal-clear plastics, the addition of up to 1 % carbon black is generally sufficient. Plastics with marked intrinsic color (e.g., ABS) are tinted with blacks of higher tinting strength at concentrations of 1-2%. Transparent tints have black contents of 0.02-0.2%. 

The ability of a pigment to change the color of an opaque film is known as its tinting strength. Both the hiding power and tinting strength are the... 

Ultramarine blue has poor opacity but high tinting strength, high heat resistance, and good alkali resistance. It is primarily used as a tinting color, and when added to whites makes them look whiter by giving them a bluish cast. 

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