Color containers

Figure 16.7 A T = 4 icosahedral virus structure contains 240 subunits in its protein shell. Each asymmetric unit (one such unit is shown in dark colors) contains four protein subunits,...

Colorant containing annatto and Ca caseinate as carrier mixed with water to be added directly to cheese milk yielding uniform colored cheese mass Water-dispersible beadlet of p-carotene is mixed with oil to attein composition that remains stable even in presence of polyphosphates and with antioxidant action even in absence of ascorbic acid Blending carotenoid pigment and soybean fiber (wifii tomato juice) as effective ingredient for dispersion stability... 

Solid phase spectrophotometry proved to be an appropriate technique for the determination of colorants in foods dne to its simplicity, selectivity, reasonable cost, low detection limits, and use of conventional instrnmentation. This simple, sensitive, and inexpensive method allowed simnltaneons determinations of Snnset Yellow FCF (SY), Quinoline Yellow, and their nnsnlfonated derivatives [Sndan I (SUD) and Quinoline Yellow Spirit Soluble (QYSS)] in mixtnres. Mixtnres of food colorants containing Tartrazine, Sunset Yellow, Ponceau 4R, Amaranth, and Brilliant Blue were simultaneously analyzed with Vis spectrophotometry without previous chemical separation. ... 

Many commercial azo colorants contain a hydroxyl group ortho to the azo group. As illustrated in Figure 3.2, this gives rise to intramolecular hydrogen-bonding which further stabilises the (F)-isomer and effectively prevents its conversion into the (Z)-form. 

Some types of paints and pigments that are used as facial make-up or hair coloring contain lead. Cosmetics that contain lead include surma and kohl, which are popular in certain Asian countries. Read the labels on hair coloring products, and keep hair dyes that contain lead acetate away from children. Do not allow children to touch hair that has been colored with lead-containing dyes or any surfaces that have come into contact with these dyes because lead compounds can rub off onto their hands and be transferred to their mouths. 

While this decomposition reaction is slow at room temperature, the disproportionation process can be accelerated by heat, certain catalysts (e.g., metal ions), and light. Traces of alkali metal ions are normally present in aqueous solutions stored in glass bottles, so plastic or wax-coated glass containers reduce the concentration of metal ion catalysts. Brown-colored containers limit the wavelengths of light that can be absorbed by the solution, restricting the initiation of the disproportionation reaction. 

A vat dye is a water-insoluble colorant containing two or more keto groups. It can thus be brought into aqueous solution by a reduction process (vatting), which converts the vat dye into its alkali-soluble enolic (leuco) form. As the soluble sodium enolate the leuco vat dye has substantivity for cellulose. The application of vat dyes to cellulosic fibres (virtually the only fibre type on which their outstanding fastness properties can be exploited) thus proceeds in four stages ... 

P.Y.62 exhibits comparably low tinctorial strength. A 0.5% pigment concentration in HD PE is necessary to produce 1/3 SD colorations (containing 1 % Ti02), compared to the 0.17% pigment concentration required to afford equal depth of shade with the somewhat more reddish diarylide yellow pigment P.Y.13. 

SD HD PE colorations containing 1 % TiOz are heat stable up to 290°C. The shrinkage of injection-molded articles is noticeably affected in the direction of flow if the processing temperature is low (220°C). This influence, however, is already very slight at 260°C. 

In plasticized PVC, P.R.242 shows good fastness to bleeding and provides average tinctorial strength. 1/3 SD colorations containing 5% TiOz require 1.1% pigment. Good heat stability makes P.R.242 a suitable candidate for use in polystyrene, ABS, PMMA, and polyester. 

Iron, Powder for Pyrotechnics. Sidorov et al claim a spark-forming composition for ppg fireworks which forms bright sparks of different colors, containing a thermal mixt a metal powder, eg (%wt) . NFLtClC 55 5, urotopine 14 2, iditol 8 2, metal powder (Fe or steel chips, powdered Al or its alloy with Mg) 23 5 (Ref 2)... 

A colorant containing a curable sulfonamide composition, (II), was prepared by Araki (4) and used on a support as a color filter. 

The light-sensitive protein complex in the rods, rho-dopsin, consists of 1 l-c/s-retinal bound as a Schiff s base to a protein, opsin. Rhodopsin is an integral constituent of membranes that form a stack of disks at one end of the cell. Cone cells, which are responsible for the perception of color, contain similar complexes in infoldings of the plasma membrane. 

These colored containers are made by anodizing aluminum, a silvery metal. 

---