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Red Litmus Paper

Treat the whole of a blue infusion, made as above, with the rod dipped in dilute sulphuric acid until it turns distinctly red. Alkalies, alkaline stained with an infusion of the petals, as a substitute for litmus paper. His althæa paper is purplish-blue when dry; acids impart a carmine hue, which is turned to bluish-green by alkalies, the neutral tint being purplish-blue; it is superior in intensity of reaction to turmeric, and quite equal to litmus, and is not affected by light, as is the case with the latter. The alkaline reaction is produced in natural or earths, and their sulphurets, restore its blue atmospheric waters; and the presence of nicolor; alkaline carbonates and the soluble trites, which change the red paper to purple, borates produce the same effect. Red litmus is indicated in greater dilution than with iothan with iopaper may also be made by holding a strip dide starch. of the blue litmus paper over a jar into which 4429. Ozonometer. This name has 2 or 3 drops of muriatic (hydrochloric) acid been given to paper prepared with a mixed have been thrown. solution of starch and iodide of potassium.