Jayalal says. Lichens have other uses. There are many dyes, medicines and important chemicals extracted from lichens. Litmus, the colour-changing dye used to make pH indicator paper, is in fact a ...

Despite the name, this dye's colour comes from pixie wings fluttering over old chicken coops - the eggs come out funky. Despite the name, this dye's colour comes from pixie wings fluttering over ...