Colour product

Table 6 classification in terms of decreasing sensitivity performances of coloured products obtained on the Nickel-chromium specimens of 50 et 30 pm Tests realized on nickel-chomium specimens of 20pm with coloured products don t change the classification. 

Table 7 gives the results of tests made with coloured products on real defects. 

COLOURED PRODUCTS BOX MANIFOLD NOTCH SPECIMEN 1 NOTCH SPECIMEN 2... 

For coloured product family selection is made on nickel-chromium specimen of 30 pm, but for fluorescent product family selection is made on nickel-chromium specimen of 10 pm. Tests made on real defects confirm these results. 

Certain members, particularly those in Class (iii), give coloured products with oxidising agents. 

The pale yellow colour cannot be removed by redistiUation or recrystal lisation the coloured product probably contains some amino compound rendering it unsuitable for conversion into a Grignard reagent. A pure... 

Fumaric acid may be prepared by heating maleic acid, with or without catalysts. It is also obtained as by-product in the manufacture of phthalic anhydride from naphthalene. The acid is a solid melting at 284°C. Fumaric acid is sometimes preferred to maleic anhydride as it is less corrosive, it tends to give lighter coloured products and the resins have slightly greater heat resistance. 

Absorption of visible light to give coloured products. 

A. Diazotisation method Discussion. In this procedure the amine is diazotised and then coupled with N-(1 -naphthyl)ethylenediamine. This leads to formation of a coloured product whose concentration can be determined with an absorptiometer or a spectrophotometer. 

Reacting in the rotating flask under vacuum gave a progress of reaction similar to the synthesis in the fluidized bed. Reactions under vacuum also gave coloured products. 

The SPP in a fluidized bed reactor with super heated steam as carrier gas gave somewhat lower molecular weight products but the samples showed hardly any UV absorption. Steam in the carrier gas reduces the overall polymerization rates, but suppresses the reactions which lead to coloured products (25). 

Blue colour ring concentrated on plasmalemma of pollen (A). Arrows on B (lower part) shows a difference in the colour between cellular surface (blue color) and apperture for the output of pollen tube (red colour). Pistil excreted blue colour product, which covers the red coloured surface of pistil. The cholinesterase activity in plants is considered as sensitive test to study the allelopathic activity (Roshchina and Roshchina 1993 Roshchina,1999 2001a). 

Observations The hydrolysis of acetylthiocholine during 1 h leads to the formation of red-brown coloured product, which can be seen without any technique (see Experiment 1) or measured by photometric technique in... 

Bisphenol derivatives show very good antioxidant activity and are the best materials for light coloured articles. Selected materials are FDA approved. These derivatives have low volatility and no effect on cure rate and do not give a bloom. A slight pink discoloration can occur after prolonged exposure to light in white or light coloured products. 

The production of light coloured products with a requirement for low build-up of static electricity requires the addition of an ingredient which is capable of providing the rubber with a low electrical resistance. Quartemary ammonium salts and ethylene oxide condensates provide one route. Of the common plasticisers, phosphate types have the lowest electrical resistance conferring properties in rubbers. Special antistatic plasticisers, such as polyethylene glycol fatty alcohol ethers, are designed to give rubbers with low surface resistivity. 

An alternative reagent which also reacts with the primary amino groups of neomycin has recently been describedl72. The reagent, diclone(2,3-dichloro-l, 4-naphthoquinone), reacts with neomycin base to form an orange-coloured product when the solution is adjusted to pH 4. 

Xanthene dyes are used as colour formers. These so-called fluorans usually contain amino groups sited para and meta to the central carbon atom. Such a substitution pattern gives rise to broad absorption bands and leads to almost black colour production the lactone 6.200 is a typical example. This xanthene derivative finds use in direct thermal printing [36]. The chemistry of fluoran leuco dyes has been reviewed [78]. 

Ephedrine (17) was known to give coloured products on exposure to sunlight. When a 1 % solution was irradiated with UV light from a 30 W tube the solution became coloured and colourless needle-shaped crystals separated. With prolonged exposure, the crystals redissolved as the solution darkened to an intense brown. On analysis, the crystalline compound was identified as the oxazolidine (18). This compound was known to be formed by reaction between ephedrine and benzaldehyde, so it was assumed that the primary photodegradation product of the drug was benzaldehyde [27]. 

Cholesterol interacts with glacial acetic acid and acetic anhydride to result into the formation of a coloured product whose absorption is measured at 630 nm and this is found to be directly proportional to the level of cholesterol present in the serum. The reaction may be expressed as follows ... 

A = Component in serum (e.g.. cholesterol), and B = Reactant that reacts with A to give a coloured product. 

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