1) Alizarin 2) Pigment 1) Alizarin 
Alizarine is a substance contained in the madder root, and largely used in dyeing reds of various shades, as Turkey red, etc. Formerly madder root was largely employed as a dye-stuff, its capability of dyeing being chiefly due to the presence in it of alizarine; but the use of the root has been almost superseded by the employment of alizarine itsel...