| Physical and Chemical Properties | Chemical Properties An edible natural blue-violet pigment made from lichen (Rocfella tinctoria). Contains the following three pigment components. Lichenol (orcin or orcinol): chemical name 5-methylresorcinol C7H8O:?H2O; Unpleasant sweet taste; White prism; Oxidation to red in air; Melting point about 56 ℃, anhydrous melting point 290 ℃; Soluble in water, ethanol and ether. Lichen red C28H24N2O7: in the presence of ammonia, it is obtained by oxidizing lichenol with hydrogen peroxide; reddish brown powdered crystallites; insoluble in water; soluble in ethanol and acetic acid, red, and red-purple in alkaline aqueous solution. Litmus (litmus): blue powder; soluble in water and alcohols. |
| Use | Use of edible purple pigment. Mainly used for beverages. |
| use | edible purple pigment. Mainly used for beverages. |
| production method | extract of dye lichen, etc. is treated with ammonia and exposed to air. Place the lichens in three times the amount of ammonia to soak, heat to 60 ℃, stir frequently and pass the air for about 3 to 7 days. Stop the reaction when it is blue, and get blue moss pigment. If you continue to treat with ammonia and air, you get red moss pigment. |
The extract of dye lichen, etc. is treated with ammonia and exposed to air. Soak the lichen in three times the amount of ammonia, heat to 60 ℃, stir frequently and pass the air for about 3-7 days. Stop the reaction when it is blue, and get blue moss pigment. If you continue to treat with ammonia or air, get red moss pigment.