bromocresol green

noun

bro·​mo·​cre·​sol green ˌbrō-mō-ˌkrē-ˌsōl-  -ˌsȯl- 

variants also bromcresol green

ˌbrōm-ˌkrē- 

: a brominated acid dye that is obtained as a yellowish crystalline powder and is used as an acid-base indicator