Wiktionary
decolourise
vb. (alternative spelling of decolourize English)
WordNet
decolourise
v. remove color from; "The sun bleached the red shirt" [syn: bleach, bleach out, decolor, decolour, decolorize, decolourize, decolorise, discolorize, discolourise, discolorise]
Usage examples of "decolourise".
Or magenta treated with a bleaching-agent in just sufficient quantity to decolourise it is invisible when used for writing.
While I was still sitting under the sickly, drowsy influence of the drugs that decolourise blood, there came a repeated knocking at the door.