Abstract

COLOUR OF ECOFRIENDLY DYES USED IN HOLI RATHER THAN TRIPHENYL METHANE DYES

Amee K. Patel, Hardik H. Chaudhary, Khushbu S. Patel and Prof. Dr. Dhrubo Jyoti Sen*

ABSTRACT

Environmentally friendly, environment-friendly, eco-friendly, nature-friendly and green are marketing claims referring to goods and services, laws, guidelines and policies that inflict reduced, minimal, or no harm at all, upon ecosystems or the environment. Triphenylmethane dye, any member of a group of extremely brilliant and intensely coloured synthetic organic dyes having molecular structures based upon that of the hydrocarbon triphenylmethane. They have poor resistance to light and to chemical bleaches and are used chiefly in copying papers, in hectograph and printing inks and in textile applications for which light fastness is not an important requirement. The triphenylmethane derivatives are among the oldest man-made dyes, a practical process for the manufacture of fuchsine having been developed in 1859. Several other members of the class were discovered before their chemical constitutions were fully understood. Crystal violet, the most important of the group, was introduced in 1883. The range of colours is not complete but includes reds, violets, blues, and greens. They are applied by various techniques, but most belong to the basic class, which are adsorbed from solution by silk or wool, but have little affinity for cotton unless it has been treated with a mordant such as tannin.

Keywords: Triphenyl methane, Leuco base, Natural colour, Synthetic colour, Dry colour, Wet colour, Malachite green, Crystal violet, Fuschin, Metanil yellow.