When once ignited it burns as readily as the vit reous variety. any substance soluble in water for which sulphuric acid (diluted) has a stronger affinity than for iron lead tin and zinc? A. Your questions are rather indefinite. All of the alkalies-soda potassa ammonia etc.-also some of the alkaline earths as lime baryta or strontia are more or less soluble in water and have stronger affinities for sulphuric acid than iron. 2. Also any substances ity than for copper? A. If we understand you most of the metallic sulphates are soluble in water and are not decomposed by strong oil of vitriol. If you mean me tallic bodies there are none that we know of that dis solve in water without decomposing it and combining with one of its elements to form bases. Platinum sil ver gold lead mercury etc. are not attacked by sul phuric acid in the cold the former not even by the hot acid. 3. Can you tell me where I can find a table show ing the relative affinities of the principal metals acids and alkalies? A. You will find such tables in most good works on chemistry. cipe for milk paint which contains considerable lime. I have used it on my walls and find it very satisfactory but knowing nothing of the effect that lime has on dif ferent coloring I have been unable to obtain the colors I wished. Will you tell me how to produce a light buff and a brown? A. Use oxide of iron or yellow ocher mixed with a little umber for the brown. A mixture of Spanish brown with a little chrome yellow gives a good yellow. Use Vandyke brown for a strong tone. use a quick bleaching liquor for bleaching cotton goods which have become yellow from long service? A. Make a strong solution of chloride of lime (hypochlorite of lime-bleaching powder) in water allow to settle and draw off the clear liquid. Rinse the goods in clean water containing about 5 per cent of sulphuric acid and then pass them slowly through the bleaching solution. They should then be well rinsed in water containing a little carbonate of sod
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