The invention provides a tobacco natural
plant dye, a preparation method, and an application thereof. The tobacco natural
plant dye is prepared from fresh tobacco as a
raw material, which is washed with a surfactant and is subjected to bio-pretreatment
impurity removal to obtain tobacco
powder. The tobacco
powder is extracted by a water solution or an
ethanol water solution, wherein the pH value of the solution is controlled by NaHCO3 or
ethylenediamine; the solution is subjected to heating extraction and is filtered to produce a
natural dye stock liquid, which is concentrated, solidified and crushed to obtain the tobacco natural
plant dye. In the method, tobacco pigments are used as natural dyes in the
dyeing and finishing industry. The preparation method is simple and is high-effective. The tobacco natural plant dye can dye cotton,
wool, cashmere and the like. Through regulation on a direct
dyeing process, a pre-
mordant dyeing process or a same-
mordant dyeing process and types of mordants, fabrics in
brown color, yellow-
brown color, light-
brown color, yellow color or green color can be produced. The dyed fabric has
high color fastness to
rubbing, has natural and gentle gloss and significantly improves usage value of tobacco and application value of the fabrics.