By Valentine Edward Johnson
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Extra resources for Chemistry and Chemical Magic
12. EXPERIMENT The Magic 34 Rosebush Aniline possesses the property of being extremely soluable in alcohol or eau-de-cologne. This is usually shown in the laboratory by dusting some of the dye over 44 CHEMISTRY AND CHEMICAL MAGIC . a sheet of white paper and then shaking the surplus off until none apparently remains. logne or alcohol be sprayed on to the paper it immediately becomes red. • If instead of scattering the dye on to paper, a white rose-bush be chosen, arid the flowers so shaken as to render any remaining dust invisible, then when sprayed or watered with alcohol or eau-de-cologne the white roses immediately become red (Fig.
EXPERIMENT The Magical 19 Drawing It is a well-known scientific fact that the vapours of mercury are very diffuse in their action, /^'IfPf - '—^fHa and palladium being _ Am strongly affe&ted by £jf mercurial vapours. Suppose for inp IG . 7. stance a design (see Fig. 7) be drawn on white paper with platinum chloride, 36 CHEMISTRY AND CHEMICAL MAGIC . such a drawing would be quite invisible. If, however, the sheet of paper be held over some mercury contained in a dish, the metal will be brought out on the paper in dark tints.
When the experiment is at an end, allow the liquid in the flask to cool until water is drawn up into it from the trough ; and finally remove the cork from the flask—with the flash under water. If these directions are followed the experiment is a perfectly safe one. The experiment with phosphuretted hydrogen and the jar of oxygen is one which should not be attempted by the inexperienced. Stick phosphorus must always be kept and cut under water. On no account pick a piece up in the fingers, as the heat of the hands is almost sure to ignite it and the result will be a nasty burn.