Indo-yellow

Baphicanthus cusia (Nees.) Bremek. Ban Lan or Da Qing Ye (leaf, root) Indirubin, indigo, indo-brown, indo-yellow, isoindigo, lacerol, tryptanthrin.53 Antidotal, febrifugal, treat fever, epidemic mumps, erysipelas, rashes, sore throat. 

Name from ghel or ghol (Indo-Germanic = yellow, shiny) chemical symbot aurum (Latin = gold)... 

Substrate products can be classified as either soluble or precipitating. Soluble peroxidase substrates include o-phenylenediamine, which is converted into a yellow product 2,2 -azino-(3-ethyl)-benzothiazoline-sulfonic acid, which is converted into a green product and tetramethylbenzidine, which is converted into a blue product. Precipitating substrates for peroxidase include 4-chloronaphthol, which yields a blue precipitate and aminoethylcarbizole, which forms a red precipitate. Alkaline phosphatase is most frequently used with p-nitrophenyl phosphate to give a yellow-orange soluble product, or with 5-bromo-4-chloro-3-indo-lyl-phosphate p-toluidine salt to yield an insoluble blue product. 

The following additional chromophores were investigated Rhodamine B (131), Indo-1 (132), Coumarin 307 (133), Cascade Blue (134), Lucifer Yellow (135), Dansyl Hydrazine (136), DAPI (137), and Bodipy (138) [85]. 

The fruit of a small tree (of the family Myrtaceae) that is native to the Indo-Malaysian region, and which was introduced into the New World tropics where it now grows wild. The rose-centered fruits are egg-shaped, about 1 1/2 in. (4 cm) in diameter, yellowish-white or pink with a yellow flesh and one or two seeds. The fruit is eaten fresh or made into jam or pies. 

For health safety reasons, the lead based chrome yellows and oranges have been replaced by the much more expensive flavanthrone yellows, perinone and indo oranges. 

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