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The purple or black color of the black carrot originates from its pigments called anthocyanins. Black carrot anthocyanins change in molecular structure as the pH of solutions change. This change in structure results in a shift in shade from red, purple to blue as the pH changes from acidic to basic.

Purple corn has one of the deepest shades in found in plants. Due to its richness in purple color, purple corn pigments have long been used to color foods and beverages.

Betanin is the most important coloring compound in red beet juice. The color of betanin depends on pH; between four and five it is bright bluish-red, becoming blue-violet as the pH increases. Once the pH reaches alkaline levels betanin degrades by hydrolysis, resulting in a yellow-brown color. Beetroot red is available as a liquid, paste, or solid, depending upon the degree of processing.

BioconColors Vegetable Carbon ( Carbon black) is made from fine particles of carbonized vegetable material, obtained through steam activation of vegetable fibers like e.g. peat, nut shells, wood and cellulose residues.

Spirulina (Arthrospira platensis) is a blue-green algae that grows naturally in freshwater. Spirulina has an extensive track record as a food supplement in many cultures. Spirulina contains green chlorophyll and phycobilins (a pigment–protein complex). The coloring properties of spirulina are the phycobilins, these are blue phycocyanins that on extraction create a range of blue hues. Spirulina color extract is available as a powder or liquid.

Purple Sweet Potato a a highly sough after source for natural food coloring, offering a raspberry pink/red/violet shade depending on the pH of the product it is being used for. Purple sweet potato is well-suited as food colorant for food products because purple sweet potato has a neutral flavor.