Pigment Yellow Solvent Green

Pigment red 122 Solvent green 3 Solvent green 28 Solvent red 111 Solvent red 135 Solvent red 179 Solvent violet 13 Solvent violet 36 Solvent yellow 93 Solvent yellow 160... 

N itro-o-phenylenediam i ne 4-N itro-o-phenylenediamine HCI 6-Nitro-o-toluidine p-Phenylenediamine Phthalocyanine green Pigment violet 19 Pigment violet 23 Ponceau SX Sodium picramate Solvent black 3 Solvent green 3 Solvent green 7 Solvent orange 1 Solvent red 1 Solvent red 3 Solvent red 23 Solvent red 43 Solvent red 48 Solvent red 72 Solvent red 73 Solvent violet 13 Solvent yellow 29 Solvent yellow 33 Solvent yellow 44 Sunset yellow Tartrazine Toluene-2,5-diamine Toluene-2,5-diamine sulfate 1,2,4-Trihydroxybenzene Ultramarines Vat red 1... 

Cl 59040 D C Green No. 8 Solvent green 7 228-787-8 Pigment yellow 12 228-810-1 Acid yellow 25 228-812-2 Acid yellow 76 228-814-3 Acid yellow 29 228-819-0 Acid yellow 17 228-823-2 Acid red 37 228-899-7 Cl 15800 D C Red No. 31 228-907-9 Acid yellow 40 228-921-5 Acid orange 3 228-922-0 Acid brown 13 228-940-9 Acid yellow 42 228-952-4 Hexyl hexanoate 228-971-8... 

Passivating is done with anti-rust coatings and primer paints containing chromates, which are also found in yellow or green pigmented paints, galvanized sheets, welding rods, and in solvents (Cronin 1980 Burrows 1983). Chromate dermatitis in the aircraft industry was first reported in 1944 (Hall 1944). 

The most common of the xanthophyll pigments, it is present in all green leaves, in blossoms and in various animal sources. It crystallizes in violet prisms with one molecule of methanol m.p. I93 C, soluble in organic solvents giving yellow solutions, li is related to a-carolene in the same way as zeaxanlhin is to /1-carolene. 

Although treated as separate classes in the Colour Index, these structural types are closely related and the few diphenylmethane dyes such as auramine (1.28 Cl Basic Yellow 2) are now of little practical interest. Commercial usage of the triarylmethane dyes and pigments has also declined considerably in favour of the major chemical classes. They were formerly noteworthy contributors to the acid, basic, mordant and solvent ranges, primarily in the violet, blue and green sectors. Numerous structural examples are recorded in the Colour Index. The terminal groupings can be amine/quinonimine, as in auramine and crystal violet (1.29 Cl Basic Violet 3), hydroxy/quinone, or both. The aryl nuclei are not always benzenoid (section 6.5). 

Many of the colors associated with higher plants (green leaves in the spring and summer, yellow or red leaves in the fall, the orange color of carrots, some colors in flower petals) are due to the presence of pigment molecules such as chlorophylls and carotenoids. In this experiment a mixture of these pigments will be isolated by solvent extraction of plant tissue, separated by chromatography, and the components identified by visible spectrophotometry. 

Tswett discovered that leaves contained two distinct green chlorophyll pigments and three or four yellow (xanthophylls) pigments. The accompanying figure depicts the separation of pigments achieved hy Tswett using carhon disulfide as solvent. Once the experiment was completed, these layers were removed individually from the column with a spatula and washed with solvent or eluted selectively with solvents. 

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