If either of the solutions known as eau de labaraque and eau de javelle are used in place of the bleaching powder, no deposit is left on the wings and the washing with acid is obviated.
He uses for bleaching a modification of the chlorine bleaching process commonly employed in cotton bleacheries, the material for which is sold by druggists as chlorate of lime.
If the bleaching does not commence readily in the chlorine solution the action may be hastened by previously dipping them in dilute hydrochloric acid.
The Dimmock method of bleaching the wings of Lepidoptera, given in Psyche, Vol.
Various methods of bleachingand mounting the wings of these insects have been given, and a few of them may be briefly outlined.
After bleaching and washing, the wings are dried by holding the slides over an alcohol flame, and a drop of glycerin is then applied and a cover glass put on at once.
Smith recommends a modification of the Dimmock process of bleaching the wings of Lepidoptera, publishing it in Insect Life, Vol.
By the Dimmock process the wings are first acted upon by a saturated solution of the chloride of lime, chlorine being, of course, the bleaching agent.
The advantage is the rapidity of work and the certainty of retaining the wings entire, the chloride of lime sometimes destroying the membrane in part before the bleaching is complete.
One of the greatest modern improvements in Paper making, isBleaching the Rags.
He has only, therefore, to find such materials as will make a Paper of a strong texture, and a fine even surface, and by the Bleaching process he can produce whatever shade of Colour he may desire.
The requisite quantity of sulphur is placed in a pot in the bleaching chamber, and then ignited, after which the doors are shut tight.
The fumes of the burning sulphur in contact with the moist hair readily exert their bleaching action on the furs, and the operation is allowed to proceed for six or eight hours, or overnight.
In the bleaching of furs, two steps may be distinguished, first degreasing, and second, bleaching proper.
The ammonia serves partially to neutralize the acid which commercial peroxide generally contains, and also to facilitate the bleaching action.
Where there is a likelihood of the leather being affected by the bleaching solution, the ammoniacal peroxide may be applied to the hair with a fine sponge or brush until sufficiently wetted, and then hanging the skins up to dry.
Some pelts, on the other hand, are particularly resistant to the action of bleaching agents and cannot be sufficiently decolorized to render them suitable for use natural, so these are also dyed.
These salts of sulphurous acid are effective in theirbleaching action only when in solution in the presence of acids.
The flow of gas which is introduced into the bleaching chamber by means of a nozzle attached to the cylinder, can be regulated, and the bleaching thus retarded or accelerated.
The bones of the combatants lay bleaching upon the plain, the flesh having been very soon devoured by the innumerable birds of prey, which appeared as if collected from every part of the Peninsula.
The use of infusions of acids and other bleaching agents to produce bright and even shades of colour.
At Sulphur Bank Springs, in the California quicksilver belt, deposition of cinnabar by moderately hot waters is actually taking place at present; also these waters are bleaching the rock in a manner often observed about mercury deposits.
She sat at one of the open southern windows, and the wind, which gently moved the snowy curtains, brought in with it the scent of bleaching clover.
As the women sat musing the moon rose, and then up sprang the night breeze, laden with the perfume of bleaching grass, and all the hot, sweet scents of the south.
The bleaching is usually accomplished by the use of a hydrosulphite, either in the form of sodium or calcium, but sometimes only the sulphurous acid gas is used.
It also acts as a bleaching agent by extracting the oxygen from the impurities and lastly it acts as a disinfectant.
The bleaching effect of none of these reagents is permanent, especially when the product is exposed to the air and light.
These are preparations of great bleaching power, found on the market under various trade names.
Bone char, being very porous, absorbs a great volume of gases, among which is oxygen, and it is ordinarily presumed that its bleaching power may be attributed to this fact.
It has a much greater bleaching and reducing action than sulphurous acid, and oxydizes very readily in combination with moisture, forming sulphate.
There is a bleaching preparation made in France known as "Redo," which is simply calcium hydrosulphite (CaS2O4).
If, however, it is desired to make a white plantation sugar, or granulated sugar, it will be advisable to subject the juice to an acidifying or bleaching treatment, as well as to the lime treatment.
Bleaching is dangerous owing to the inhalation of chloral fumes.
Several methods have been suggested for bleaching rosin; in some instances the constitution of the rosin is altered, and in others the cost is too great or the process impracticable.
Having allowed it to rest, and drawn off the liquor and sediment (chiefly sand), the palm oil is ready for treatment with the bleaching reagent, which consists of potassium bichromate and commercial muriatic acid.
Lagos is the best quality, whilst Camaroons, Bonny, Old Calabar and New Calabar oils are in good request for bleaching purposes.
Of the various methods suggested for bleaching palm oil, the bichromate process originated by Watts is undoubtedly the best.
The palm oil, freed from solid impurities by melting and subsidence, is placed in the bleaching tank, and washed with water containing a little hydrochloric acid.
The bleaching of linen and the distillation of whisky are both carried on to a small extent, but the people are chiefly employed in agricultural pursuits and in the sale of home produce.
Weak oxidants may also be used as bleaching agents to remove coloured by-products without seriously attacking the ligno-cellulose, which is obtained in its bleached form.
I venture therefore an opinion that the cause is to be found in the defective bleaching and manufacture of the rags from which the paper is made and the careless or intentional admixture of linen with cotton rags.
Puratylene," a mixture of bleaching powder and hydroxide of lime, made very porous, and containing from eighteen to twenty per cent of active chlorine.
Printing, bleachingand dyeing works, paper and chemical works, india-rubber and tobacco manufactures are among the chief of the other resources of this great industrial region.
This can, it is true, be removed by alkalies, but in that case the manganese is precipitated as the brown peroxide, an effect also produced by bleaching powder.
Mr Hodges contends that the absence of caustic lime from his new bleaching compound gives it great advantages over the old bleaching powder, particularly in its application to finely woven fabrics, such as muslins, &c.
Each box is provided with water, a solution of the bleaching agent, and steam pipes, and is capable of reeling at a time about 500 lbs.
From this vessel it is conducted through wooden pipes (which are so contrived that they can be opened and cleansed at will), into a large cistern standing in the bleaching house.
It is employed for washing wool and for the manufacture of 'permanent white' by treatment with chloride of barium; also for the preparation of Glauber salts, and of hypochlorite of magnesia for bleaching linen.
By passing chlorine through water holding the hydrate in suspension; or by mixing a salt of nickel with bleaching powder.
These were not the only bleachingoperations the flax went through; others will be detailed in the chapter on hand-weaving.
Sometimes thebleaching was done with slaked lime or with buttermilk.
This bleaching was called crofting in England, and grassing in America.
An instrument to test the decoloring or bleaching power of chloride of lime.
A white wax, made bybleaching and purifying ozocerite, and used as a substitute for beeswax.
The process of testing the bleaching power of any combination of chlorine.
The mild reagents employed soften all the colors of good rugs without bleaching them or impairing their fastness to light.
How should we be enabled to cause vegetable colours to vanish as if touched by the hand of a magician were it not for the bleaching properties of chlorine?
In the spring of the year, Miss Thusa always engaged in a very interesting process--that is, bleaching the flaxen thread which she had been spinning during the winter.
This was called Miss Thusa's bleaching ground, and nature seemed to have laid it out for her especial use.
Putting her wheel carefully in its accustomed corner, she descended the stairs, and bent her steps to the bleaching ground.
She insisted on bleaching it also, and flew about among the long grass, with her bright watering pot, like a living flower sprung up in the wilderness.
Its branches swept against the fence which enclosed Miss Thusa's bleaching ground.
Mittie happened to be standing on the rustic bridge, near the celebrated bleaching ground of Miss Thusa, when her brother and his friend arrived.
Ever since then, when the bleaching time comes, it keeps me perfectly miserable till it is over.
Here was one so novel, so pure, that his soul seemed purified from the soil of temptation, while he involuntarily surrendered himself to it, as Miss Thusa's thread grew white under the bleaching rays of a vernal sun.
Electrolysis is also used to some extent in reducing metals from their ores, in bleaching fibre, in manufacturing hydrogen and oxygen from water, and in the chemical treatment of sewage.
In some processes the electrolysis affords directly an alkaline hypochlorite or a chlorate, the former being of wide commercial use as a bleaching agent in textile works and in the paper industry.
From the metallic sodium solid caustic soda is then derived by a secondary reaction, while the chlorine is combined with lime to form chloride of lime or bleaching powder.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bleaching" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: bleach; bleaching; discoloration; fading; frosting; lightening; whitening; whitewashing
