Cresol red. (o-cresolsulfonephthalein).
Synonyms: o-Cresol Red, water soluble; o-Cresol Red, sodium salt~o-Cresolsulphonephthalein sodium salt; Cresol red sodium salt; Cresol red solution; Cresolsodiumsalt; Cresol red (0.04% in water); "cresol red, water soluble"; 2-Cresolsulfonephthalein sodium salt.
To make 0.1% (w/v) aqueous solution for color range pH 0.0 (red) to pH 1.0 (yellow) then pH 7.0 (yellow) to pH 8.8 (red).
Forensics Lab Supply Number 0113116.
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/Cresol_Red