Xylenol orange is an organic reagent, most commonly used as a tetrasodium salt as an indicator for metal titrations. Historically, commercial preparations of it have been notoriously impure, sometimes consisting of as little as 20% xylenol orange, and containing large amounts of semi-xylenol orange and iminodiacetic acid.
Xylose or wood sugar, is an aldopentose a monosaccharide containing five carbon atoms and including an aldehyde functional group. It has chemical formula c5h10o5. Xylose is found in the embryos of most edible plants. It was first isolated from wood by koch in 1881.
Xylyl bromide, t-stoff or methylbenzyl bromide, was used as a tear gas in world war i under the name weisskreuz (white cross). It was a popular agent due to its easy manufacture. Its first effective use in battle is dated to august 1914, in the battle of ypres, when the french used tear gas grenades with xylyl bromide on germans.