Penggunaan zat warna alam untuk kulit non konvensional

The objective of this experiment was to apply the natural dyes for non conventional leather with mordant environmental friendly. This research used lizard skins, cobra skins and kakap fish skins from dried preservation; woods extract of secang, tegeran, nangka, mahoni and tinggi; chrome and syntan as tanning agent; alum as mordant and material additives for tanning. The methods of this research were preparation of solution extract, tanning and testing. The principles of dyeing with the natural dyes used natural dyes withoud mixed dyestuffs and mordant environtment friendly. The research results showed that the natural dyes from secang woods, tegeran woods, nangka woods, mahoni woods and tingi bark were acid dyes with pH of 4 ? 5 and they could be applied on lizard skins, cobra skins and kakap fish skins. The natural dyes from mahoni woods had superior acid resistance (sulphate acid, formic acid and acetate acid), the value was 4/5 (grey scale) and also they had the dry and wet rub fastness which were better than those of natural dyes from secang, tegeran, nangka, and tinggi.