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hoppycalif · 12-12-2006, 09:48 AM

As best I can determine, bromothymol blue is the only pH indicator dye that gives yellow to blue readings, that is used in such test kits. There are a few others that give different colors, and for differenct pH ranges, but not for yellow to blue.

12-12-2006, 09:48 AM	#131 (permalink)
hoppycalif Senior Member Join Date: Apr 2005 Location: Sacramento, CA, USA Posts: 5,208 iTrader Ratings: 20 iTrader Positive Rating: 100% Plant Points: 227345	As best I can determine, bromothymol blue is the only pH indicator dye that gives yellow to blue readings, that is used in such test kits. There are a few others that give different colors, and for differenct pH ranges, but not for yellow to blue.