The following group reagents precipitate narceine:—picric acid, tannin solution, and potassium dichromate on long standing.
Maybe—but so is picric acid; so is nitroglycerin; and so is pure gold.
No,” said the purchaser, “that picric acid you have sent me is not an explosive.
This is not the case, however, as regards piperin and picric acid.
picric acid, mercuric chloride, and alkaloidal “group reagents” give no precipitate.
It is rapidly decomposed by an excess of alcohol into picric acid and anthracene, the solution assuming a yellow tint.
The picric acid is purified by neutralising the yellow mass with potassa, and crystallising twice out of water.
The action of picric acid mixed with the paste can only augment and aggravate the irritation of the wounds.
The head was washed and shaved and then painted with picric acid.
It precipitates with tannic and phosphotungstic acids but not with picric, acetic, trichloracetic, or chromic acids.