Monday, May 9, 2011

ULTRA VIOLET LIGHT

           The fluorescence is often useful but the possible presence of small quantities of strongly fluorescing non resin bodies must be considered. violet blue phenol formaldehyde but audience and copolymers polystyrene polyvinyl Carbondale counterman blue polyvinyl acetate polyvinyl formal urea formaldehyde melamine formaldehyde nylon polyatomic acid polyatomic methyl ester chlorinated rubber cellulose acetate alkyd polyvinyl chloride yellow polycrystalline cellulose nitrate polyvinyl methyl ether cyclohexanol condensates .White .cellulose polyvinyl alcohol casein.

LIEBERMAN  TORCH  TEST :
           Put a few drops of acetic anhydride on the cloth add one drop of cone . sulphuric acid and oner the  Color over a few minutes. ( see also p 456 ) yellow phenol formaldehyde changes to reddish brown videophone chloride. brown alkyd polyvinyl acetate counterman aldehyde condensates c opal .green polyvinyl chloride acetate blue polyvinyl chloride polyvinyl acetate red cyclohexanol violet natural resin ( diabetic acid ) None nylon. wine malice anhydride resins.

PHENYLALANINE THIAMINE TEST :
         The fabric is steeped for one hour in a saturated aqueous solution of the reagent then for fifteen minutes in twenty vol hydrogen peroxide mauve brown indicates cellulose fibers and urea formaldehyde resins yellow indicate thermoplastic resins.

KIT ON BLUE V TEST
         A  little fabric is steeped for several hours in a cold solution of piton blue V at PH 3.1 blue indicates lignite celluloses urea formaldehyde resins and polyatomic no Co lour indicates cellulose fibers and phenol formaldehyde type .