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(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.



(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 periodicals archive ?
Richard Overton, managing director of Regenology, said: "We are looking forward to capturing on film the construction of the new Archbishop Blanch secondary school.
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IRELAND winger Damien Blanch is set to make his first Engage Super League appearance for 10 months as Wakefield look to maintain their 100% start to the season at St Helens on Friday.
Dubai: The Tiger Woods Dubai Monday announced that John Blanch, the operations team leader, had been named as one of the 20 'Most Admired Operators' by Golf Inc magazine.
He moved to New York City, where he made his living before retiring to Blanch, N.
That's not surprising in the case of England's underachievers, butWakefield's Damien Blanch is entitled to look back with pride on his efforts for unfashionable Ireland.
Winger Damien Blanch scored three tries for Ireland andndash; all when the Tongan team had a player in the sin bin andndash; to keep the prospect of an upset alive until the end.
Huge colonies of feral cats are being discovered in the grounds of factories and in woodland across the region, according to Janet Blanch, manager of The New Cramar Cat Sanctuary, in Redditch Road, Hopwood.
Finally, tip the vegetables into another colander and allow them to drain while you blanch the next lot.