Oils, color yellowness

OIL SOLUBLE AZO DYES The oil soluble, water-iasoluble, azo dyes dissolve ia oils, fats, waxes, etc. Generally, yellow, orange, red, and brown oil colors are azo stmctures and greens, blues, and violets are primarily anthraquiaones (see Dyes, anthraquinone). Blacks are usually nigrosiaes and iaduhnes of the aziae type (see Azinedyes). An example is Oil Red [85-83-6] (127) (Cl Solvent Red 24 Cl 26105). Uses iaclude the coloring of hydrocarbons, waxes, oils, candles, etc. 

Chemical Designations - Synonyms Cresote Oil Dead Oil Chemical Formula Mixture. Observable Characteristics - Physical State (as normally shipped) Liquid Color. Yellow to brown to black Odor. Creosote or tarry aromatic. 

There is as yet no agreed international list of permitted food colours. Thus a food dye that is permitted in one country may be considered unacceptable in another. The synthetic food colorants permitted in the European Union are listed in Table 1.8 [60]. All were originally introduced as acid dyes for wool many years ago. Furthermore, more than thirty colorants of natural origin are permitted in most countries. The natural carotenoid dyes are of outstanding importance for colouring edible fats and oils. These yellow to red methine dye structures occur in many families of plants and animals, including vegetables, berries,... 

Unsaturated fats, as noted in Section 13.3, tend to be liquids at room temperature. They can be transformed to a more solid consistency, however, by hydrogenation, a chemical process in which hydrogen atoms are added to carbon—carbon double bonds. Mix a partially hydrogenated vegetable oil with yellow food coloring, a little salt, and the organic compound butyric acid for flavor, and you have margarine, which become popular around the time of World War II as an alternative to butter. Many food products, such as chocolate bars, contain partially... 

Flame color depends on fuel composition. Gas often burns blue, but heavy fuel oil burns yellow. A yellow flame is caused by thermal cracking of the fuel. There is nothing wrong with a yellow flame it is the general shape of the flame which is important. If in doubt as to the right flame shape for a particular furnace, contact the burner manufacturer for details. 

A mixture of 8 g. (0.032 mole) of p-iodonitrobenzene (p. 184) and 6 g. (0.095 gram atom) of copper powder is heated in an oil bath. Reaction starts at a temperature of 220°, and the color of the mixture changes to brown. The bath temperature is raised slowly to 235°, at which point the reaction is complete. The cooled mass is extracted with portions of boiling toluene until the liquid extract is not colored yellow. The combined toluene extracts are treated with activated carbon and evaporated to a small volume and cooled. 4,4 -Dinitro-biphenyl precipitates in 52% yield as yellow needles melting at 237°. 

Most oils are yellow-red or amber liquids. The color is from the presence of chlorophylls and carotenoids. The colored bodies are often removed during the bleaching... 

Zinc chromium oxide (ZrCr04) Zinc hydroxychromate Zinc tetraoxychromate Zinc tetraoxychromate 76A Zinc tetraoxychromate 780B Zinc tetroxychromate Zinc yellow Zincro ZTO. Used as a yellow pigment in paints, varnishes, oil colors, linoleum, rubber etc. [hydrate] fine yellow powder slightly soluble in H2O. Landers-Segal Color. 

Whale-oil—Trairvoil—obtained by trying out the fat or blubber of the right whale and of other species of balcence. It is of sp. gr. 0.934 at 15° (59° P.) brownish in color becomes solid at about 0° has a very nauseous taste and odor. It is colored yellow by HjSOi and is blackened by Cl. 

The Ra value In Table 3.7 is between the SA and RA cosolvents For example, the Intermolecular forces manifested by 2-ethyl hexyl acetate and diethyl ether are surprisingly similar — separated by an Ra value of only 1.18 MPa. These cosolvents would be a good choice to remove linseed oil (light yellow color in Table 3.7) — if one was not concerned about flammability or stability of the ether. 

Oil color Clear yellow oil with a spicy odor and taste. The oil is as acceptable as the odor of olive or peanut oils (Rymal et al., 1974). Density 0.9158 at 20°C (Morad et al., 1980). 

So now we have this solvent containing ketone, dried with MgS04... Not being able to vac-distill today, took about 50 mis of solvent/ketone and placed in beaker on stir plate and boiled off the solvent. The resulting oil was a nice reddish-orange color. Had a very unique smell too. Took about 2 grams worth of this ail, added to a test tube containing a saturated solution of sodium bisulfite... In less than 60 seconds the oil precipitated into a whitish yellow mass (very similar to what acetone would do if added to a bisulfite solution). Never had this quick of a crystallization. Not... 

Most of the final product producing recipes in this book will provide for the chemist to take up the final free base product in DCM. Usually the freebase oil in the DCM is dark. Used to be that Someone-Who-ls-Not-Strike (SWINS) would have to distill the freebase to get clear yellow oil before crystallizing because when SWINS used ether or ethanol as a crystallization solvent, the colored crap would contaminate the final product. But not with DCM. Even with the grungiest (well...not too grungy) freebase, the crystals that come out are pure snow. The DCM so strongly solvates the contaminants that none remain in the mass of crystalled final product. The filter cake is sooooo clean even in the darkest solvent ... 

Ethyl bis-(2,4-dinitrophenyl) acetate (indicator) the stock solution is prepared by saturating a solution containing equal volumes of alcohol and acetone with the indicator pH range colorless 7.4-9.1 deep blue. This compound is available commercially. The preparation of this compound is described by Fehnel and Amstutz, Ind. Eng. Chem., Anal. Ed. 16 53 (1944), and by von Richter, Ber. 21 2470 (1888), who recommended it for the titration of orange- and red-colored solutions or dark oils in which the endpoint of phenol-phthalein is not easily visible. The indicator is an orange solid which after crystallization from benzene gives pale yellow crystals melting at 150-153.5°C, uncorrected. 

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