Dye - colored substance that has an affinity to the substrate to which it is being applied.
Substrate - the material or substance on which an enzyme acts.
Aqueous solution - is a solution in which the solvent is water.
Pigment - is a material that changes the color of light it reflects as the result of selective color absorption.
Carotenoids - organic pigments that are naturally occuring in chromoplasts of plants and some other photosynthetic organisms like algae, some types of fungi and bacteria.
Chlorophyll - is a green pigment found in most plants
Mordant - is a substance used to set dyes on fabrics forming an insoluble compound with the dye.
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