Brilliant yellow

Other Names Brilliant Yellow C C.I. Direct Yellow 4 C.I. Direct Yellow 4, disodium salt Benzo Brilliant Yellow Brilliant Fast Yellow G2N Brilliant Paper Yellow Brilliant Paper Yellow C Brilliant Paper Yellow P Brilliant Yellow Brilliant Yellow (indicator) C.1.24890 Calcomine Brilliant Paper Yellow Chlorazol Brilliant Yellow 3G Diaphtamine Brilliant Fast Yellow 3G Diazol Brilliant Yellow N Direct Brilliant Yellow G Direct Yellow 4 Fenamin Yellow 3G Kayaku Direct Yellow G Nippon Brilliant Yellow G Paper Yellow 3GX Paper Yellow 3GXA Paper Yellow CB Tertrodirect Yellow B Trisulfon Paper Yellow 

CA Index Name Benzenesulfonic acid, 2,2 -(l,2-ethenediyl) w[5-[(4-hydroxyphenyl)azo]-, disodium salt 

Chemical/Dye Class Azo Molecular Formula C26HigN408S2Na2 Molecular Weight 624.56 pH Range 6.4-8.0 

Solubility Soluble in water slightly soluble in ethanol, acetone UV-Visible (X x) 497 nm Melting Point 250°C Synthesis Synthetic methodsi 3 

Major Applications Display device,4 sensors,5 6 photochrotnic materials, inks, detergent, cos-metics,io biosensors, i assay for enzyme activity,antifungal agent,i3 antiAlDS agenti Safety/Toxicity No data available 

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The camphorquinone can be purified in either of two ways, (i) To save time, the drained but still damp material can be recrystallised from water containing 10% of acetic acid, the hot filtered solution being cooled and vigorously stirred. The quinone separates as brilliant yellow crystals (yield, 2 5 g.), m.p. 192-194 , increased to 196-197 by a second reciystal-lisation. (ii) The crude camphorquinone can be dried in a vacuum desiccator (weight of dry quinone, 5 g.), and then recrystallised from petroleum (b.p. 100-120 ), the hot solution being filtered through a fluted paper in a pre-heated funnel. The quinone separates in beautiful crystals, m.p. 196-197 , 2 8 g. 

Post-curing and chemical modification improves chemical and solvent resistance (20). Paraformaldehyde and acetylene diurea are added to a hot borax solution. Toluenesulfonamide (p and o), a few drops of phosphorous acid. Brilliant Yellow 6G [2429-76-7] Rhodamine E3B, and Rhodamine 6GDN [989-38-8] are added. After heating, the mass is cured in an oven at 150°C. The resulting cured resin is thermoset but can be ground to fine particle sizes. 

Table. The characteristics of brilliant yellow adducts with polymers...

Brilliant yellow form Polymer pH interval TTiaX5 nm nm pK (pHi ) ApK (pHi )... 

Usually blue-grey colored chromatogram zones are produced on a colorless [19, 24, 25] to pale grey background [26] cyclochlorotin and simatoxin yield brilliant yellow zones [14] and urea derivatives yellow, green or blue colors [21]. 

To understand precipitation reactions, it is essential to work with the ionic species that exist in aqueous solution. For instance, mixing colorless solutions of lead(II) nitrate and potassium iodide causes a brilliant yellow solid to precipitate from the mixture (Figure 4-4t. To identity this yellow solid, we must examine the chemical species present in the solutions. 

French researchers provided an alternative to the tartrazine synthetic colorant (E 102), valorizing a phloridzine oxidation product (POP) generated as a by-product of the cider industry. Phloridzine is a polyphenol specific to apples and shows good antioxidant capacity. When apples are pressed to yield juice, phloridzine, oxygen, and polyphenoloxidase enzyme combine to form POP. This brilliant yellow natural colorant with nuances dependent on pH level can be incorporated easily into water-based foods such as beverages (juices, syrups) and confectionery creams because it is stable during production processes. Details about the specific formulations of these colorants are presented in Section 5.1. 

A cook recognizes the tell-tale signs of an overflowing pot of boiling water—the characteristic hiss as the water hits the hot gas burner and evaporates and the familiar accompanying yellow glow. Chemistry on the atomic level is responsible for the brilliant yellow illumination. 

Brilliant yellow ALKALINE RANGE Yellow/orange 7.0-8.8... 

An example of a new material without toxicological problems is the brilliant yellow, bismuth vanadate. Cl Pigment Yellow 184, made by the reaction of bismuth nitrate with sodium vanadate, followed by calcining at 300-700 °C. 

The chloroplatinate, [Pt(NH3)4Cl2]PtCl6, is obtained by mixing solutions of sodium chloroplatinate and dichloro-tetrammino-platinic nitrate, or by the prolonged action of chlorine on either the green salt of Magnus or the preceding salt suspended in -water. It crystallises in brilliant yellow prisms which are soluble in hot water. Hydrochloric and nitric acids precipitate the chloride and the nitrate respectively.2... 

Bismuth vanadate pigments are used in the manufacture of lead-free, weather resistant, brilliant yellow colors for automobile finishes and industrial paints. They are suitable for the pigmentation of solvent-containing paints, water-based paints, powder coatings, and coil-coating systems. It can be mixed with other pigments... 

Silver Pyrovanadate, Ag4V207, is obtained as a dense yellow precipitate by the addition of neutral silver nitrate to sodium pyrovanadate solution. It has also been obtained as brilliant yellow, transparent plates.9 M.pt. 383° C.1 ... 

LUMINESCENTMATERIALS - FLUORESCENT PIGMENTS (DAYLIGHT)] (Vol 15) Brilliant Yellow 10G [2744-50-5]... 

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