Blanching

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blanching

[′blan·chiŋ]
(food engineering)
A hot-water or steam direct-scalding treatment of raw foodstuffs of particulate type to inactivate enzymes which otherwise might cause quality deterioration, particularly of flavor, during processing or storage.

Blanching

 

(1) In the food-processing industry, blanching is the processing of fruits and vegetables in hot water. This prevents them from darkening and makes the vegetable cells permeable to sugar molecules, which facilitates jam-making. Blanching is also used in the production of raisins and the withering of grapes in the production of sweet and ordinary wines. Blanching for one to three minutes shortens the withering process two to three times.

(2) In the tanning industry blanching is used to remove the residues of subcutaneous cellulose tissues from the lower (flesh side) of skins. After blanching, the surface of the flesh side becomes very smooth, and after dressing and glazing, it becomes lustrous. Skins are also blanched to achieve uniform thickness and to remove defects that cannot be removed by polishing after the application of coatings on the outer side of the skin.

References in classic literature ?
de Bellegarde's blanched pupils were fixed upon her face.
This sleeping under roofs has blanched thee like an almond.
By what passions had she been ravaged, by what sufferings had she been blanched, what store of memories had she laid away for the monotonous future?
At this moment a soft half-light pervaded the studio; but a parting ray of the evening sunlight suddenly illuminated the spot where the soldier sat, so that his noble, blanched face, his black hair, and his clothes were bathed in its glow.
Adam's young bride was proud of her man, but she blanched at the thought of the ghastly White Worm.
By the light of the corridor-lamp I saw my sister appear at the opening, her face blanched with terror, her hands groping for help, her whole figure swaying to and fro like that of a drunkard.
The man was sitting up, blanched and ghastly, with returning reason in his eyes, and hands which rubbed nervously at the broad red band which still encircled his throat.
Welland imparted, blanched and demolished by the unwonted obligation of having at last to fix her eyes on the unpleasant and the discreditable.
Percerin turned crimson; an ominous sign indeed in old men blanched by age.
And then he drew back with a cry, and a blanched face.
Under the soft copper of her skin she blanched just a trifle; but her eyes were brave and level, and the haughty tilt of her firm little chin was eloquent of loathing and contempt.
Dalloway's face blanched for a second as she helped herself and saw the potatoes roll this way and that.