Formaldehyde-methylene blue

Experiment 12. Schardinger s Reaction.—Of two 25 c.c. portions of fresh milk one is boiled for a short time and cooled then 1 C.c. of the formaldehyde (prepared in an earlier experiment) and a few drops of an aqueous solution of methylene blue are added to each portion. When the two samples are now warmed to about 50° the dye in the unboiled milk is very rapidly decolorised and the same happens to further amounts added. In the boiled milk the colour remains unaltered. 

The foam-scrubbing technique has been studied for a variety of gases, including ammonia, sulfur dioxide, hydrogen sulfide, formaldehyde, and nitrogen oxides. Liquid and solid streams that have been experimented with include sulfuric acid fog and mist, dust, fly ash, and methylene blue. 

Sansoni prepared several samples of polycondensates of resorcinol, formaldehyde and Methylene Blue and tested their redox properties by repeated oxidation reduction cycles,9 with ammoniacal sodium dithionite as the reductant and acidic hydrogen peroxide as the oxidant. The best resins had a redox capacity of. 5 5 8 meq of Fe(lll) per gram. This novolac type of condensation was later used th azo dyes to give thermosetting colored coating compositions. When dye molecules are available with two condensable... 

Metham potassium. See Potassium N-methyldithiocarbamate Metham sodium. See Metam-sodium Methanal. See Formaldehyde Methanamide. See Formamide Methanamine. See Methylamine, aqueous solutions Methylamine Methanamine, N-methyl-. See Dimethylamine Methanamine, N-methyl-, compd. with borane (1 1). See Dimethylamine borane Methanamine, N-methyl-N-nitroso-. See N-Nitrosodimethylamine Methanamine, N-methyl-, polymer with (chloromethyl) oxirane. See Dimethylamine/epichlorohydrin copolymer Methanaminium, 1-carboxy-N,N,N-trimethyl-, chloride. See Betaine hydrochloride Methanaminium, N-(4-((2-chlorophenyl) (4-(dimethylamino) phenyl) methylene)-2,5-cyclohexadien-1-ylidene)-N-methyl-, chloride. See Basic blue 1... 

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