That is, no image is formed where the light acts, and the reaction is the formation of blue due to the union of a ferrous salt with ferrocyanide of potassium.
The paper is coated with the solution and used as already directed, being developed in ferrocyanide of potassium solution and washed with water, treated with weak hydrochloric acid, and then finally cleaned from all traces of acid.
Prussian Blue--A compound prepared by adding potassiumferrocyanide to a solution of ferrous sulphate.
Copper salts with certain substances, such as potassium ferrocyanide solution, potassium sulphydrate, calcium sulphydrate, and pyrogallic acid give dark-brown colorations.
The composition with which the 'Fire Annihilator' is charged is a mixture of dried ferrocyanide of potassium, sugar, and chlorate of potassa.
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.
Lastly, it is yielded when a metallic cyanide or ferrocyanide is decomposed by an acid, this latter being the means by which it is invariably procured.
It is not necessary to dissolve the ferrocyanide in water previous to adding the sulphuric acid, as it readily dissolves in the water during the process of distillation.
By adding ferrocyanide of potassium to ordinary ink, an indelible writing ink may be obtained.
Moisten the suspected bread with a few drops of a solution of ferrocyanide of potassium.
It may be obtained by adding to a solution of a copper salt, a solution of ferrocyanide of potassium; when a precipitate is obtained, which dried, is of a brown colour, and is cyanide of copper.
From ferrocyanide of potassium in fine powder, and 8 or 10 times its weight of concentrated sulphuric acid, heated together in a glass retort.
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 strained liquor is free from colour, and is not discoloured by the addition of either sulphuretted hydrogen or ferrocyanide of potassium.
A mixture of ferrocyanide of potassium and litharge is heated as before, and dissolved out by alcohol, and crystallised.
It is totally soluble in water; the solution is neutral to litmus and turmeric, unaffected by ferrocyanide of potassium, and not precipitated by acids nor alkalies, nor acted on by the magnet.
From persulphate of iron andferrocyanide of potassium, as the last.
The neutral solutions of palladium are precipitated in the metallic state by ferrous sulphate, dark brown by sulphuretted hydrogen, olive by ferrocyanide of potassium, and yellowish white by cyanide of mercury.
Another method is to make the iron substance red hot, and then to sprinkle powdered potassicferrocyanide all over it.
Add the ferrocyanide solution; cool and dilute to exactly 1 liter.
It is always well to make Bordeaux mixture by using theferrocyanide of potassium test--Cornell University.
The preparation of ferrocyanide of potassium for this test may be explained.
Dip out a little of the Bordeaux mixture in a cup or saucer and drop the ferrocyanide on it.
Continue to add to the mixture this milk of lime so long as drops of ferrocyanide of potassium (yellow prussiate of potash) applied to the Bordeaux mixture continue to change from yellow to brown color.
An explosive mixture, consisting of sawdust, charcoal, niter, and ferrocyanide of potassium, used as a substitute for gunpowder.
When the salt is completely dissolved, the solution is found to contain ferrocyanide (red prussiate) of potassium, mixed with nitroprusside and nitrate of the same base.
One-fifth of this quantity (one atom) of the acid is sufficient to transfer the ferrocyanide into nitroprusside; but the use of a larger quantity is found to give the best results.
Deprive the ferrocyanide of potassium (2KCy + FeCy) of its water by heating it over the spirit-lamp in a porcelain dish.
The ferrocyanide solution is standardized by dissolving 1 gramme of pure zinc in 6 cc.
The iron can be tested qualitatively in the acid solution by ferrocyanide of potassium, or it can be determined by the ordinary methods.
Cu, and a solution of ferrocyanide of potash in water is prepared, strength 4 per cent.
The following do not precipitate:--Mercuric cyanide and potassium ferrocyanide solutions.
One of the best of these is based upon the brown colour whichferrocyanide of potash produces in very dilute solutions of copper.
The watery solution decomposes readily with the formation of algae; it gives no precipitate with ferrocyanide of potassium, chloride of barium, or nitrate of silver, unless concentrated.
If no iron is dissolved the stain should then be treated with dilute nitric acid, and the liquid tested with ferrocyanide of potash, &c.
It will be recalled that we have used the method of fusion with potassium carbonate to find iron in potassium ferrocyanide (p.
Dry, pulverized potassium ferrocyanide is intimately mixed with dry potassium carbonate and the mixture heated in a hard glass test tube.
Zinc also gives white precipitates with ferrocyanide of potassium and ammonia.
It should then be mixed with black flux or dryferrocyanide of potassium and reduced, as already described.
Ferrocyanide of potassium gives a claret-colored gelatinous precipitate, if the copper be abundant; otherwise the deposit is of a light brown.
If the gelatine has been treated with a drop of potassium ferrocyanide solution instead of salicylate of sodium, a few drops of FeSO4 will give a blue pattern.
Certain chemical precipitates such as copper ferrocyanide can form membranes having properties analogous to those of osmotic membranes.
Or we may treat the gelatine with ferrocyanide of potassium and salicylate of sodium mixed, and thus obtain an intermediary colour on the addition of FeSO4.
Graham had already obtained colourless jellies by the interaction of concentrated solutions of ferrocyanide of potassium and sulphate of copper.
These were obtained from gelatine and tannin, from acetate of copper or lead, and from nitrate of mercury in an aqueous solution of ferrocyanide of potassium.
It consists of a vessel of porous porcelain, the pores of which are filled with a colloidal solution of ferrocyanide of copper.
Buetschli also has recently described the microscopic appearance of precipitated membranes produced by ferrocyanide of potassium and acetate or chloride of iron.
We do not expect to obtain the results of a ferruginous treatment from the administration of a ferrocyanide or a ferricyanide.
In this way he studied the mutual reactions of solutions of ferrocyanide of potash, chloride of iron, and the sulphates of copper, iron, manganese, and zinc.
Ammonium chloride in a potassium ferrocyanide solution produces growths shaped like catkins, and the alkaline chlorides tend to produce vermiform growths.
If we put side by side on our gelatine plate a drop of sulphate of copper and another of ferrocyanide of potassium, the point of contact of the two fluids will be sharply marked by a line of precipitate.
Most metals give precipitates with ferrocyanide of potassium in acid solutions.
If the quantity of ferrocyanide required is known within a few c.
Some of these, ferrocyanide and ferricyanide of potassium for example, have such characteristic properties that the fact that they are cyanides may be overlooked.
Arrange a series of drops of the solution of ferrocyanide of potassium on a porcelain slab, and, with the help of a glass rod, bring a drop of the assay solution in contact with one of these.
The standardferrocyanide solution is made by dissolving 43.
The quantity of zinc in the solution must be approximately known; run in a little less of the ferrocyanide than is expected will be necessary; test a drop or two of the assay, and then run in, one or two c.
The precipitate of zinc ferrocyanide formed in the assay solution is white; but if traces of iron are present, it becomes bluish.
If no coloration was caused by the action of sulphuretted hydrogen, it is probably that either a solution of ferrocyanide of potassium or a persalt of iron has been resorted to.
It is scarcely necessary to add that the latter solution can be used as the ink, and the ferrocyanide as the developer.
The fluid is filtered, and ammonia added to the filtrate: in presence of copper, the solution acquires a blue color, and gives a reddish precipitate upon addition of ferrocyanide of potassium.
Characters written with a solution of ferrocyanide of potassium acquire a blue color, if washed with a solution of perchloride of iron.
The manuscript under examination is again spread upon a glass-plate, and a solution of tannin (or preferably, a solution of ferrocyanide of potassium containing one per cent.
If the fluid is acidulated with a few drops of acetic acid, and a drop of ferrocyanide of potassium added, a white precipitate, or, at least, turbidity is produced.
Titanium green is a ferrocyanide of that metal, produced by adding yellow prussiate of potash to a solution of titanic acid in dilute hydrochloric acid, and heating the mixture to ebullition rapidly.
Vanadium Green falls when ferrocyanide of potassium is added to vanadic acid dissolved in a strong acid.
Ferrocyanide of Iron is an excellent tonic and antiperiodic remedy, and often is combined with quinine.
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.
Red coloration is due to decomposition into ferrocyanideof copper.
Instead of developing by ferrocyanide you may develop by the cobalt or chromo-cyanogen salts, or by an alkaline mellonide arsenite, etc.
What potassic ferrocyanide was doing on board the Boreal I did not know, and I had neither the means, nor the force of mind, alas!
A small quantity of ferrocyanide of potash will throw down a whitish-green precipitate, indicating nickel.
If the ore be crushed and heated in nitric acid until dissolved, some water added, and an addition made to the solution of a few drops of ferrocyanide of potassium, a dark blood-red precipitate is thrown down.
If the solution of cyanide of potassium that is used is strong, the greater portion of the ferrocyanide of potassium crystalises in the solution, and may be collected and preserved for use again.
To a solution of sulphate of copper, add a solution of ferrocyanide of pottasium, so long as a precipitate continues to be formed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "ferrocyanide" in a variety of sentences. We hope that you will now be able to make sentences using this word.
