Cupferron. (N-nitroso-N-phenylhydroxylamine ammonium salt).
Cupferron is an analytical reagent that is used to separate tin from zinc, and copper and iron from other metals.
In analytical laboratories, cupferron is a reagent used for quantitative determination of vanadates and titanium and colorimetric determination of aluminum.
Forensics Lab Supply Number 0110263.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
The quantity of 1 gram is offered for those who require only the least amount of an item, especially for mixing up a stock solution. If a greater amount is required, a lower price per gram can be worked out, depending upon available supply. Place an order for the number of grams that are needed, and add a note to contact you by email before processing an order so that a price may be agreed upon.
Wikipedia reference http://en.wikipedia.org/wiki/Cupferron
MSDS is at http://ptcl.chem.ox.ac.uk/MSDS/CU/cupferron.html