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Blue Litmus Test Paper

Trit-line and acid test, may be prepared by urate 1 ounce litmus in a wedgwood-ware dividing the ethereal solution of alkanet red mortar with 3 or 4 fluid ounces boiling water; into two equal parts; to one is added, drop put the mixture into a flask, and add more by drop, a watery solution of carbonate of boiling water until the liquid measures fully soda, until the red just has changed to a disjust has changed to a dispint; agitate it frequently until cold, then tinct blue hue; then both liquids are mixed filter it; divide the filtered fluid into 2 equal and used for the preparation of the paper. portions, stir one portion with a glass rod This, when dried, has to be kept in tightly dipped into very dilute sulphuric acid, repeat- closed bottles. ing this until the liquid begins to be very 4428. Test Paper from Hollyhock slightly tinged red, then add the other portion Flowers. Some years ago Prof. Aiken, of and mix them thoroughly. Prepare the paper the University of Maryland, proposed paper with this infusion. Acids turn it red; alkalies, green. The neutral salts of most of the heavy metallic oxides redden this as well as the other blue test papers that are affected by acids.