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From three-hundredths to one-tenth of a grain of copper per gallon has been found in aërated lemonade, ginger ale, soda water, etc. In making the ultimate analysis of organic compounds by combustion, with lead chromate and metallic copper reduced by hydrogen, the results obtained are too high, on account of the expulsion of hydrogen, which had been occluded by the copper.
A numerous series of minerals from Russia, such as red chromate of lead, white carbonate of lead, green phosphate of lead; native copper, green and blue carbonate of copper; gold ore from Berezof; iron ore, granitical rocks, fossil shells, in good preservation, from the banks of the Moscorika, and others in the siliceous state, jaspers, crystals of quartz, beril, &c.
=Bismuth.= The bismuth salts are not poisonous, but may contain arsenic as an impurity, although this is far less common than it was some years ago. =Chromic Acid, Chromate, Bichromate of Potassium.= These act as corrosives when solid or in concentrated liquid forms. In dilute solutions they act as irritants. Used as dyes; have proved fatal more than once.
A man may be the greatest proficient in the knowledge of the principles of chemical science, and yet be utterly ignorant of how bleaching powder, chromate of potash, or soda are made. Thus it was with the Chemical Chair at the Andersonian until Mr.
The product of the calcination of equal parts of lead and tin 2 parts, carbonate of soda 1 part, antimonic acid 1 part, rub together, or triturate, and melt. Litharge 18 parts, sand 4 parts, oxide of antimony 2 parts, sienna earth 2 parts; melt. If it is too deep the proportion of sienna earth may be decreased. Chromate of lead 1 part, minium 3 parts.
From the weight of the latter the arsenic sulphide is calculated. As a less accurate but more rapid method, the ammoniacal solution of arsenic sulphide is cautiously neutralized with pure dilute nitric acid and considerably diluted. It is then titrated with decinormal silver nitrate till a drop of the solution is turned brown with neutral chromate.
Cadmium sulphide, lead chromate and orpiment. Green Pigment. Black Pigment. Lamp black. This is one of the pigments for black lacquer, but does not give a brilliant colour, therefore it is better to prepare the black lacquer by adding iron powder or some compound of iron to the lacquer. Various mixed colours are obtained by mixing some of the above-mentioned pigments.
Other marine bodies, at the height of upwards of 3400 metres or 3683 yards, on the summit of Mont-Perdu, in the Upper Pyrenees. Wolfram, near St. Yriex, in Upper Vienne. Oxyd of antimony, at Allemont, in the department of L'Isere. Chromate of iron, near Gassin, in the department of Le Var, at the bastide of the cascade. Oxyd of uranite, at St.
The colors used for this style of painting are zinc white, green oxide of chrome, cobalt green, chromate of lead, colcothar, ochers, and ultramarine. Soluble glass has also been used in the manufacture of soaps made with palm and cocoanut oil; this body renders them more alkaline and harder. Interesting experiments have been made with soluble glass for coloring corals and shells.
As an example of such a formation, a ray of white light was passed separately through a solution of yellow chromate of potash and an alkaline litmus solution, throwing respectively a yellow and violet-blue color upon the screen.
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