Bromothymol blue is a chemical that turns green or yellow when exposed to high levels of carbon dioxide. It’s chemical composition is C27H28Br2O5S
by Woofle_124 May 5, 2023

by anon duh October 15, 2021

a fucking legend, noone in the world can compare to him. the journy from windsor to the nba!! ig: abdallaiismael_
by abdalla btb November 25, 2020

BTB means (back the blue) referring to supporting cops! Respecting or supporting officers. Being grateful for their service and protection.
by Cali Girl17 May 27, 2021

by killinitBTB August 4, 2008
