The red color in vegetable dyes can be extracted from madder, safflower, etc., the yellow color is extracted from gardenia, turmeric, and sophora flowers, and the cyan color is indigo made of blue grass. Therefore, there is a famous saying that blue ...
The red color in vegetable dyes can be extracted from madder, sa...
The red color in vegetable dyes can be extracted from madder, safflower, etc., the yellow color is extracted from gardenia, turmeric, and sophora flowers, and the cyan color is indigo made of blue gra...