decolourise

Updated: May 25, 2025

While I was still sitting under the sickly, drowsy influence of the drugs that decolourise blood, there came a repeated knocking at the door. It ceased, footsteps went away and returned, and the knocking was resumed. There was an attempt to push something under the door a blue paper. Then in a fit of irritation I rose and went and flung the door wide open. 'Now then? said I.

H. G. (Herbert George) Wells - The Invisible Man

Then, too, silver nitrate dissolved in ammonia gradually turns black as it is acted on by light and air. Or magenta treated with a bleaching-agent in just sufficient quantity to decolourise it is invisible when used for writing. But the original colour reappears as the oxygen of the air acts upon the pigment.

Arthur B. (Arthur Benjamin) Reeve - The Poisoned Pen

Then, too, silver nitrate dissolved in ammonia gradually turns black as it is acted on by light and air. Or magenta treated with a bleaching-agent in just sufficient quantity to decolourise it is invisible when used for writing. But the original colour reappears as the oxygen of the air acts upon the pigment.

Arthur B. (Arthur Benjamin) Reeve - The Poisoned Pen