Buy Indigo® phenolphthalein test papers for fast, inexpensive ammonia gas leak detection. Ammonia changes phenolphthalein paper from white to pink at pH 8.3 & higher. Only $3.95 for 100 strips; save even more with quantity discounts.

Find ammonia gas leaks by wetting one end of the test paper with water and then holding it near the suspected leak. If the color change is immediate, get a protective mask with an air supply.

If you need a supersensitive detector for gloveboxes, click on ammonia leak detector cloth. Or, if you need a semiquantitative measurement for use in bioreactors or waste management, click on 0-100ppm ammonia test strips.