All venoms exhibit most of the chemical reactions characteristic of the proteids:—
Millon’s reaction.
Xantho-proteic reaction (heating with nitric acid and subsequent addition of ammonia = orange coloration).
Biuret reaction (caustic potash and traces of sulphate of copper).
Precipitation by picric acid, disappearing on being heated, reappearing when cooled.
Precipitation by saturation with chloride of sodium.
Precipitation by saturation with sulphate of magnesium.
Precipitation by saturation with ammonium sulphate.
Precipitation by a 5 per cent. solution of sulphate of copper.
Precipitation by alcohol.