Abstract
Differences in colors and their fastness have been investigated by changing the alkyl group to methyl, ethyl, n-propyl and n-butyl in Fast Blue RR type developing agent (2-benzoylamino-5-aminohydroguinone dialkyl ether) or by changing the alkyl group of Violet Base Chiba III type (having 2-p-cresoxyacetamino group in Fast Blue RR type).
The result indicated that the coloration was in order of n-propyl<n-butyl<methyl<ethyl in Fast Blue RR type. In Violet Base III type, metyl derivative only showed the development of light purple coloration while all others showed blue coloration of the same intensity and an increase in numbers of carbon atoms in alkyl group was not accompanied with deep coloration. In all cases, there were no great differences in fastness, being 5-6 grade for light and 4-5 grade for washing and rubbing.
