The slightest trace of bleach will turn such test papers blue or violet according to the amount present.
If a handful of the pulp after bleaching, when squeezed out, does not turn the test paper violet or blue, then the absence of any free bleach is taken for granted.
Sometimes the requisite volume of clear bleach liquor is added to the pulp in the breaker, and the material kept in constant circulation until the operation has been completed.
In some mills any excess of bleachis neutralised by the use of an "antichlor" such as sodium hyposulphite, or sodium sulphite, but the best results are undoubtedly obtained when the quantity of chemicals used is kept at a minimum.
If the bleach has no action, incinerate some of the dyed fibre in an iron crucible and heat the ash on charcoal before the blowpipe.
The process of washing must be carried out in a thorough manner in order to remove all soluble compounds, which if left would cause an unnecessary waste of bleach in the subsequent stages of purification.
The amount of bleach added should be about 20 per cent.
In this way the amount of bleaching powder required to bleach the pulp is determined.
A more general plan is to bleach the citrate of lime by covering it with a weak solution of chloride of lime, exposing it in shallow vessels to the sun's rays, and rewashing it before decomposing it with sulphuric acid.
Twaddle is usually regarded as the best and safest strength, yet in some bleach works, particularly for inferior and less tender goods, this is greatly increased, even up to 5 deg.
It has been proposed to bleach the tincture of myrrh with animal charcoal, but this interferes with its proper action.
Both the above are used to filter and bleach oils.
These are all soluble in water, and bleach like the acid.
Thomas Henry of Manchester was the first to bleach with chlorine in the Lancashire district, and to his independent investigations several of the early improvements in the application of the material were due.
A half-bleach on jute is obtained by steeping the goods alternately in bleaching powder (or hypochlorite of soda) and sulphuric acid, washing intervening.
The most drastic bleach is that required for goods which are subsequently to be printed.
Although it is possible to bleach jute white, this is seldom if ever carried out on a large scale owing to the great expense involved.
A more permanent bleach is obtained by steeping the wool in hydrogen peroxide (of 12 volumes strength), let down with about three times its bulk of water and rendered slightly alkaline with ammonia or silicate of soda.
In the mixers appearing in the right foreground lime, picric acid, and water are mixed to form a solution of calcium picric, and bleach and water are mixed to form a cream.
A blotting paper that will not only dry the blot, but bleach the remainder of it can be made by passing ordinary blotting paper or card through a concentrated solution of oxalic acid.
To bleach sheepskin parchment white, expose the pieces to strong sunlight under glass, in a moist atmosphere.
And was that what caused you to bleach your hair, and change your complexion?
It does not look so bad as it might, and the mere fact that you did not bleach it through vanity makes me more tolerant of it.
I suppose that all girls are more or less foolish about their complexions; but no girl of refinement should bleach her hair.
Developers with a liability to stain will give prints which do not bleach out so completely as those made with cleaner working developers.
But, in all cases, two to three minutes' action of the bleaching solution will be ample; if all pure black is not gone in this time, it is a sign that the bleach is becoming exhausted.
The strength can be varied; for those goods that only require a very slight bleach the proportions may be 1 to 12, while for dark goods the proportions first given may be used.
I shall not be the only one whose bones will bleach there.
The first thing that struck Philip and Krantz, when they were ushered into the presence of the king, was the beautiful cleanliness which everywhere prevailed: every dress was spotless and white as the sun could bleach it.
His bones will bleach in the wilderness, and the spirit-hunter and his wolfish daughter are avenged.
Amongst these waste products the worst are those coming from chemical works, paper works, bleach works, etc.
Chlorine and bleaching-powder solutions soon attack and destroy silk, and so another and milder agent, namely, sulphurous acid, is used to bleach this fibre.
Iron Rust--Soap the stain thoroughly with lemon juice; sprinkle with salt and bleach for several hours in the sun.
Scorch Stains--Wet the scorched place, rub with soap and bleach in the sun.
It is evident from this explanation that chlorine will only bleach those substances which are changed into colorless compounds by oxidation.
It is on this account used to bleach paper, straw goods, and even such foods as canned corn.
The body of the unlucky trapper was buried near the spot where he fell, but was soon dug up by the wolves, and his bones left to bleach in the wintry sun.
Simpson and myself obtained a remount, bade good-by to our dead mules which had served us so well, and after collecting the ornaments and other plunder from the dead Indians, we left their bodies and bones to bleach on the prairie.
The carcasses of the treacherous Indians were left to be devoured by wolves, and their bones to bleach in the sun and wind--a warning to their tribe, that such foul treachery as they had meditated had met with a merited retribution.
They happened to strike it in the center of a long stretch of desert, extending sixty miles without either water or pasture; and many animals had perished here, leaving their bones to bleach upon the plain.
It is claimed by some that certain fluids will bleach and bring out the natural color.
Grandmother Allen used to bleach those she made on her hand loom.
Do you remember how we said grandmother used to bleach her linen?
Do you know how our grandmothers used to bleach sheets and other unbleached articles which they wished to have white?
Our face bleach will turn the skin of a black or brown person four or five shades lighter, and of a mulatto perfectly white.
The madder bleach of the present day generally includes the following series of operations:-- (1) Stitching.
Then again with goods sold in the white, it is customary to weave coloured headings or markings, and as these have to be preserved, to do so will cause some slight alteration of the details of the bleach with this object.
It is much better, when a single chemicing does not bleachthe cloth sufficiently and give a white, to run the cloth twice through a weak liquor rather than once through a strong liquor.
Outlines of two or three such processes, which are now in use in bleach works, will serve to show the general routine of a market bleach.
The remarks made when describing similar operations of the madder bleach as to the action, testing, etc.
In the first case the bleach need not be of such a perfect character as in the last case, which again must be more perfect than the second class of bleach.
Besides this two other kinds of bleach are distinguished in the trade.
As the madder bleach is by far the most perfect of the three, and practically includes the others, this will be described in detail, and differences between it and the others will be then pointed out.
A piece is subjected to the madder bleach which has afterwards to be printed with madder or alizarine.
So far the routine has been described of the so-called madder bleach, the most perfect kind of bleach applied to cotton cloths.
Now, unless the bleach has been thorough, the whites will be more or less stained permanently, and to avoid this cloths which are to be printed with alizarine colours are most thoroughly bleached.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bleach" in a variety of sentences. We hope that you will now be able to make sentences using this word.
