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Etymology: ME, blechen
the act or process of removing stains or color by chemical means.
Dentistry The process of removing stains from the teeth; whitening is the generally preferred term
Dermatology The process of removing color or pigment from the skin using various potentially harmful chemicals
Environment A mass extinction of coral in certain regions which is variously attributed to global warming or to local stressors
Vox populi The removing of stains or colours, in particular, the process of whitening fabrics by chemicals—e.g., bleach, or bleaching powder consisting of chloride of lime


Technique used to brighten stained teeth.
Mentioned in: Cosmetic Dentistry


1. The process of changing colour from the pink of a dark-adapted retina to a pale yellow colour after it has been exposed to light. This is due to the reaction of the rhodopsin pigment. The process is reversible if the healthy retina is allowed to remain in the dark.
2. Process to remove a tint from organic lenses. See visual pigment.

bleach, bleach·ing

(blēch, blēching)
Removal of color from an object using chemicals or light.


n the use of a chemical oxidizing agent to lighten tooth discolorations. Preferred term is
whitening. See also agent, whitening.
References in periodicals archive ?
Clan to Clearance is enmeshed in the present-day, as any discussion tying itself to the themes of clan, clearance, and crofting must be.
It gave crofting communities the right to buy their own land.
In order to account for the popularity of the slides, we need to ask how Wilson's narrative produced the Highlands and islands for domestic audiences at the high point of British imperialism, to consider what sort of cultural capital was invested in the photographic enterprise, to speculate on how the images were implicated in the dynamic relationship between core and periphery, and to insist that through these photographs the crofting population was not merely subjected to the unreturnable gaze of tourists and metropolitan authority.
The book was a milestone in the assertion of crofting rights and the land question in the 70s.
4 million in grants each year to crofters towards the cost of building or improving their homes with the aim of attracting and retaining people in the crofting areas of Scotland.
The Crofting Acts of the late 19th Century had ended the monstrous iniquity of summary eviction and gave tenants security to work and improve their lands.
The west of Ireland and crofting areas of the Hebrides are their closest stronghold but they also breed throughout eastern Europe into central Asia.
The traditional, thatched crofting houses were restored after the last remaining residents of Gearrannan were moved out in 1974.
The programme, to be shown next month, will reveal their part in the Clearances, which saw tenant crofting families forced off land to make way for animals.
The selected candidate would also get a car allowance to cover the crofting townships and cottages scattered along the road between Toscaig, in the south, and Kenmore on the north coast road - a distance of about 20 miles.
He had an interesting background, coming from a crofting community near Durness on the extreme north coast of Scotland and is thought to have used his skills solely in Huddersfield.
It will allow the SCVO to support rural communities outside crofting counties in preparing investment plans and bid for cash from schemes like the Big Lottery fund.