1) Shade of red 
Perinone is a class of organic compounds. The parent compound has two isomers, each of which are useful pigments. It is prepared from naphthalenetetracarboxylic dianhydride by condensation with o-phenylenediamine. The two Isomers of perinone are useful pigments. The trans isomer is called Pigment Orange 43 (`PO43`) and the cis isomer is called P.....