- a white powder that decomposes on contact with water and has the characteristic odor of gaseous chlorine: regarded, when dry, as a mixed calcium hypochlorite-chloride, used as a commercial bleach for wood pulp, textiles, oils, and soaps, and in laundering as a decolorizer and disinfectant.
Origin of bleaching powder
First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for bleaching powder
The important element in bleaching-powder is the chlorine which it contains.Electricity and Magnetism
The second modification of bleaching-powder is designated "puratylene," and contains calcium chloride and quick or slaked lime.
As a special acetylene purifier, bleaching-powder exists in at least two chief modifications.
A solution of bleaching-powder gives with solution of the sulphate a purple colour changing to red-brown.Aids to Forensic Medicine and Toxicology
W. G. Aitchison Robertson
Arsenic is insoluble in the acid, but immediately dissolves in the bleaching-powder.
- a white powder with the odour of chlorine, consisting of chlorinated calcium hydroxide with an approximate formula CaCl(OCl).4H 2 O. It is used in solution as a bleaching agent and disinfectantAlso called: chloride of lime, chlorinated lime