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Cabbage Test Paper

Make a strong infusion of red cabbage leaves, strain it, and evaporate it by a gentle heat till considerably reduced. Then dip the paper in it quantity of gas introduced is usually about 5 and dry it in the air. (This paper is of a times the volume of the liquid. In making greyish color; alkalies change it to green, chalybeate and sulphuretted water, the water acids to red. It is a very delicate test; if should be previously boiled, to expel all air rendered slightly green by an alkali, carbonic from it. Caracid will restore the color.)