Dye is a natural/synthetic substance that finds application for adding a color/altering existing color shade. As a coloring material, dyes are used to color commodities of day to day use and can be applied everywhere including
Plastic toys for children
From products like food
These are hardly any industries left where dyes are not used commercially. As a coloring substance, dye has an ionizing and aromatic organic compound that affinity to substrate to which it is being applied. Generally being applied in aqueous solution, it may need mordant to improve fastness of dye on fibers.
The support from dyes assists in :-
Easily manipulating things according to our liking like at basic level, use color in identifying individual components of tissue sections
Dyes are applied to substrates like textiles, plastic, paper, food
These are also completely/partially soluble in which these are put to.