An indicating paper that is sensitive to ammonia and other alkaline materials. Zellner's paper is prepared in two steps. First it is dyed black with a substantive dye. Second it is soaked in a solution of soluble fluorescein (see Fluorescein sodium). The dried strips detect alkalis and ammonia at the part per million level.
Sources Checked for Data in Record
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 4195