4,7-Diphenyl-1,10-phenanthroline-x.x-disulfonic acid disodium salt indicator.
Synonyms: o-Phenanthroline, ortho-Phenanthroline.
For the colorimetric determination of iron.
Base for oxidation-reduction indicator.
Forensics Lab Supply Number 0110304.
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/Phenanthroline