The Ammonia Leak Detection Cloth is treated with a dilute ethanol solution of bromothymol blue and phenolphthalein (10:1 ratio) and air dried. When dry, the cloth is a yellow-orange color. When exposed to ammonia vapors, [...]
Since the ammonia leak detection cloth is simply measuring pH, any interferences present that create an acidic or alkaline environment competing with the effect of any ammonia gas would interact with the cloth.
The dyes are not bound to the cloth with any special binders. They will wash out. They may also discolor materials they contact.
Yes, the cloths are reversible. As long as the cloth reverts back to the original goldenrod yellow color, it will continue to change when exposed to ammonia vapors. We aren’t certain of how many times [...]