I have a peculiar kind of steel which I cannot harden by fire and water, neither will it caseharden by prussiate of potash.
In default of prussiate of potash, animal or even vegetable charcoal may be used, but the latter is a very imperfect substitute.
The civilised method of case-hardening, is to brighten up the iron and to cover it with prussiate of potash, either powdered or made into a paste.
The iron is then heated, until the prussiate of potash has burned away: this operation is repeated three or four times.
The most deadly of all poisons, prussic or hydrocyanic acid, is obtained from the ferrocyanide of potassium, or prussiate of potash, by adding diluted sulphuric acid and distilling the vapour into an ice-cold receiver.
The red prussiate is made by passing chlorine over the yellow prussiate in powder dissolving and crystallizing.
If a crystal of prussiate of potash be similarly heated, its yellow colour will vanish, but re-appear on being dropped into water.
Or, mix the solution of prussiate of potash with that of nitrate of bismuth, and a yellow will be the product.
Or, mix the solution of prussiate of potash with that of sulphate of copper, and the mixture will be of a reddish brown colour.
This hair dye gives a dark brown color, but great care has to be exercised in its use, the yellow prussiate of potash being very poisonous.
Tigere, 1817, treated the pulp of the paper, previous to sizing, with a solution of prussiate of potash.
Stevenson, 1837, incorporated into paper a metallic base such as manganese, and a neutral compound like prussiate of potash, to protect writing from being tampered with.
Apply a warm sample of a slightly acid solution of yellow prussiate of potash; iron rust will be indicated by a blue coloration.
Introduced prussiate of potash and oxalic acid or such other alkaline salts or acids into the pulp, in order to indicate fraud in the removal of cancellation stamps or written marks.
To test for the other three violets: (a) Apply chloride of lime, to be followed by a solution of yellow prussiate of potash: absence of a blue coloration leaves orchil and logwood to be considered.
On the other hand, yellow prussiate of potash, with acetic acid in successive operations is of great service in treating the most perplexing palimpsests.
Treated paper with a preparation of iron, together with ammonia, prussiate of potash and chlorine, while in the pulp or being sized.
The following is a very effectual remedy: take twenty grains of quinine, combined with one drachm of prussiate of iron, and divide it into ten powders, and administer a powder every three hours until the pain is completely arrested.
Have ready in another vessel a hot solution of prussiate of potash, to which a small quantity of sulphuric acid has been added.
The peculiar salt-radical which exists in the so-called red prussiate of potash.
The goods, previously polished and finished, are heated to a bright-red, and rubbed or sprinkled over with prussiate of potash.
A mordant of blue vitriol is commonly first given, followed by a bath of prussiate of potash.
Water acidulated with vinegar, digested on the powder, should not be blackened, or even materially darkened, by tincture of galls or a solution of red prussiate of potash; the contrary shows the presence of ferruginous colouring matter.
Coat the goods with a paste made of a concentrated solution of prussiate of potash and loam; then expose them to a strong red heat, and when it has fallen to a dull red, plunge the whole into cold water.
Sal-ammoniac and bone-dust, of each 2 parts; prussiate of potash, 1 part.
As soon as the prussiate appears to be decomposed and dissipated the articles are plunged into cold water.
By the topical application of prussiate of potash (ferrocyanide of potassium) any part of a piece of iron may be case-hardened without interfering with the rest.
To one gallon boiling Soft Water add three-fourths ounce Extract of Logwood; boil two minutes; remove from the fire and stir in forty-eight grains Bichromate of Potash and eight grains Prussiate of Potash.
For ten gallons use six and one-half ounces Logwood Extract, one ounce Bichromate of Potash, and eighty grains Prussiate Potash; strain.
On the Preparation of Ferro-prussiate of Potash, by M.
Gautier’s Ferro-prussiate of Potash, as described in this Journal for July, 1827 ib.
On the Preparation of Ferro-prussiate of Potash ib.
The solution which has given the crystals of carbonate of potash contains a little carbonate of potash, and much ferro-prussiate of potash.
A beautiful brown can be obtained by next putting the goods through a solution of prussiate of potash.
In a few hours dry the paper thoroughly, and carefully brush off the yellow prussiate of potash.
Dry the moistened paper somewhat, leaving it just moist enough to hold a uniform layer of fine yellow prussiate of potash.
A weak solution of sulphate of iron; turns BLUE when moistened with a weak solution of prussiate of potassa, and BLACK when moistened with infusion of galls.
It is known that the whole of the protosalt has been converted into a persalt when a minute drop of the liquid, placed in contact with a solution of red prussiate of potash on a white plate, ceases to strike with it a blue colour.
This valuable salt, the well-known 'prussiate of potash' of commerce, was discovered by the illustrious Scheele about the middle of the 18th century.
This is a variety of Prussian blue, remarkable for its beautiful colour, and may be distinguished from the ordinary Prussian blue of commerce by its action on the yellow prussiate of potash.
Precipitate a solution of protosulphate of iron with another of red prussiate of potash (ferricyanide of potassium.
When adding the stock lime solution as directed above, continue until the prussiate testing solution when dropped into the Bordeaux mixture will no longer turn brown; then add a little more lime to be on the safe side.
The amount of lime stock solution to be used is determined as follows: at the druggist's get an ounce of yellow prussiate of potash dissolved in a pint of water, with a quill in the cork of the bottle so that it may be dropped out.
In the first process, the paper being charged with the uranic salt and exposed to the solar influence under the negative to be copied, is washed with a solution of the ferridcyanide or red prussiate of potash.
As to the proofs in gallate (or tannate) of iron, they can be transformed into Prussian blue in a solution of potassium ferrocyanide (yellow prussiate of potash) slightly acidified by sulphuric acid.
This done, immerse in a solution of red prussiate of potash at 2 per cent.
I have since had the opportunity of trying the nitro-prusside of sodium, which, by itself, gives a blue and white picture, in color like that obtained from the red prussiate of potash.
If in place of gallic acid I use a diluted solution of potassium ferricyanide (red prussiate of potash), Prussian blue is formed in the parts acted on by light.
The simplest solution to use for this purpose is known as the Howard Farmer reducer and is a solution of hypo mixed with a small quantity of potassium ferricyanide (red prussiate of potash).
A dark-brown is the result of the action of copper salts on the yellow prussiate of potash; the sulphate of copper in soft woods gives a pretty reddish-brown colour, in streaks and shades, and becomes very rich after polishing or varnishing.
A lighter blue can be obtained by hot solutions of indigo, of sulphate of copper, and by the successive introduction of pyrolignite of iron and prussiate of potash.
A yellowish green may be obtained by the action of copper salts on the red prussiate of potash.
Before arriving at the conclusion that these proportions were the best to be used, I made a series of purely empirical experiments, beginning with the proportions: Red prussiate of potash.
The Best Chemicals for this Work are the recrystallized red prussiate of potash and the citrate of iron and ammonia, which is manufactured by Powers & Wightman, of Philadelphia.
The proportions of the sensitizing liquid, as originally given me by Mr Barnes, were as follows: Red prussiate of potash.
Next, that a preparation containing Red prussiateof potash.
The yellow prussiate once more forms a good test, but to ensure the absence of free mineral acids, it is first well to add a little acetate of soda solution.
A drop or two of the prussiate solution then gives a brown colour, even if but traces of copper are present.
The prussiate is obtained in large ratio from woollen rags, after the separation of all the pieces that can be worked up into shoddy for cheap cloth.
Another suggestion bears relation to the utilisation of refuse from the manufacture of prussiate of potash, a most valuable product in the hands of the manufacturing chemist.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "prussiate" in a variety of sentences. We hope that you will now be able to make sentences using this word.
