It is a kind of natural edible pigment extracted from plants rich
in chlorophyll. The main compositions are disodium copper
chlorophyll and trisodium copper chlorophyll. The powder from Kelly
to darkslategray is soluble in water, but insoluble in oil. At PH
7.0 or above, it is green and can be used in the coloring of
medicine, foodstuff and daily-used chemicals.
