Calcon (Eriochrome black B).
Calcon is the sodium salt of Eriochrome Black R. Used for titrating Ca++.
Also called Eriochrome Blue Black R and mordant black 17 monosodium salt.
Forensics Lab Supply Number 0110265.
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.
MSDS is at http://ptcl.chem.ox.ac.uk/MSDS/CA/calcon.html