Alizarin orange

Nitroalizarin (l,2-dihydroxy-3-nitro-9,10-anthraquinone. Alizarin Orange) [568-93-4] M 285.2, m 244" (dec), pKEst(i) 4.6, pKEst(2) 9.6. Crystd from acetic acid. 

Alizarine red (S marks), Erweco alizarine acid red, alizarine orange S W, alizarine cyanine, brilliant alizarine cyanine, anthracene blue (S Marks), acid alizarine blue, alizarine dark green W, alizarine blue (S Marks), alizarine green A alizarine black S, alizarine indigo blue (S Marksl, coeruleine (S Marks). 0 n the addition of a few drops of dilute caustic soda (1 20), the colour becomes more 1 intense, and bluer ... 

Persian berries on A1 or Cr mordants, alizarine orange on A1 mordant. 

Nitro, amino and sulphonic acid derivatives of alizarin are also dyes of various colors and are known as alizarin orange, alizarin maroon, alizarin red, etc. Also there is present in the madder root another dye compound known as puipurin which is 1-2-4-tri-hydroxy anthraqui-none. Isomeric tri-hydroxy anthraquinones are dyes also but it is interesting that in all of these poly-hydroxy anthraquinones which are dyes two of the hydroxyls are always in the 1-2 positions. 

It comes into commerce in paste as Alizarin Orange, and is used in dyeing and printing, though its principal application is in the manufacture of Alizarin Blue. 

On alumina mordants it dyes an orange-yellow shade, similar to alizarin orange, but owing to its high price has not been used practically. 

Dihydroxy-3-nitro-9,10-anthracenedione Alizarin Orange C,4H7N0e 568-93-4 285.209 oran nd or pi (HOAc) 244 dec sub sl HjO s EtOH, bz, chi, suit, HOAc... 

Meanwhile Caro and three assistants developed manufacturing processes for the production of the alizarin orange. In May 1877 Rosenstiehl left the further development work to Caro. The dye was not a big seller, but would later gain... 

Hydroxy-5-[(4-nitrophenyl)azo]benzoic acid, 9CI. 5-[(p-Nitrophenyl)azo]salicylic acid. 4 -Nitro-4-oxyazobenzene-3-carboxylic acid. Alizarine orange 2GN. C.I. Mordant orange 1. Azochromol orange R. Brasilon chrome orange R. Kenachrome orange. C.I. 14030. Numerous other proprietary names [2243-76-7]... 

Alizarine maroon, A-00079 Alizarine navy blue AT, see G-00005 Alizarine orange, A-00080... 

Alizarine orange, A-00080 Alizarine red S Na salt, in A-00081 4-Aminoazobenzene-4 -arsonic acid A -Di-Me, in A-00095... 

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