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24 hours 48 hours amount applied arc or ultra-violet breaking strength Bureau of Standards CANCELING INKS carbon paper cent rag bond chemical coated coloring matter composition Concentrated ink copying ink determined dilute direct sunlight dissolved ethyl acetate examination fabric ferric ferrous sulphate fiber filter formula Gallic acid glycerol Government master specification gum arabic heat hectograph hydrochloric acid inches ingredients ink containing insoluble iron gallotannate inks large number legible light for 48 logwood manifold copies manufacture marks method methyl violet mixture modern inks nigrosine nutgalls oxalic acid oxide permanence phenol pigment press copies Printing Inks Prussian blue reagents sample should show Schluttig and Neumann Schultz sediment soap sodium bisulphite Soluble blue solvent stamp pad Standards Circular streaks strips suitable sulphide sunlight for 96 synthetic dyes Tannic acid tannin temperature test specimens typewriter ribbons ultra-violet light United States Government weigh writing fluid writing inks