Zinc filings

A mixture with excess zinc filings explodes on heating... 

Zinc filings produce a beautiful blue color it is a substance very difficult to file. ... 

Blue fire for cascades meal powder 16 parts, saltpeter 8, sulfur 12, and zinc filings 12 parts. 

Composition for lances. Yellow saltpeter 16 parts, meal powder 16, sulfur 4, amber 4, and colophony 3 parts. Rose saltpeter 16 parts, lampblack 1, meal powder 3. White saltpeter 16 parts, sulfur 8, meal powder 4. Blue saltpeter 16 parts, antimony (sulfide) 8, very fine zinc filings 4. Green saltpeter 16 parts, sulfur 6, verdigris 16, and antimony (sulfide) 6 parts. 

Zinc filings Meal powder.. .. Vegetable black. 14 28 4 10 15... 

A typical smoke composition is as follows letrachlorethane or chloronaphthalene, 40 to 50 per cent. zinc filings, 3 per cent. nijtre saltpetre, pitch and calcium silicate, 15 per cent. 

Mr. Anderson has in the furnace a very hot cmcible. I am about to throw into it some zinc filings, and they will burn with flame like gunpowder. I make this experiment because you can make it well at home. Now I want you to see what will be the result of the combustion of this zinc. Here it is burning - burning beautifully like a candle, I may say. But what is all that smoke, and what are those little clouds of wool which will come to you if you can... 

Priestley regarded the gas as vitriolic acid divested of the water with which it is usually combined , although in another place he says some metals will part with their phlogiston to hot oil of vitriol, and thereby convert it into a permanent elastic air . The gas obtained with charcoal is only partly soluble in water and the residue is fixed air, since it made lime water turbid. A saturated solution of vitriolic acid air when warmed with zinc filings, evolved inflammable air. The vegetable add air he afterwards said was not a proper air perhaps it was merely acetic acid vapour. 

Copper - turnings Brass - filings Iron - filings Zinc - filings Nickel - fine powder Chromium - technical powder Lead - small shot Tin - coarse powder Aluminium - coarse powder... 

Boil 01 g with either 1 g of aluminium powder in 15 ml of 33 per cent acetic acid and 40 ml of water, or with 2 5 g of zinc filings (No. 20 powder) in 15 ml of glacial acetic acid and 40 ml of water for thirty minutes under reflux. Wash down the condenser, filter through cotton wool and determine the chlorine by Volhard s method. 1 ml 0-lN AgNOa = 0-005514 g. 

The formic acid may be replaced by acetic acid according to Chambers, with the advantage that phenylmercuric nitrate is soluble in the latter and hydrolysis is rapid. Two volumes of glacial acetic acid and 1 volume of water is a suitable solvent and zinc filings are preferable to the powder. 

Reaction conditions 1. activated zinc filings, ether reflux 4 h 2a. 1N KOH,... 

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