Religious clothing some communities by all married men) on Rosh Hashanah, Hoshanah Rabbah, Tefilas Tal, and Tefilas Geshem. A groom will generally wear a kittel during the wedding ceremony as well. In some Sefardic communities, a Rabbi or a Hazzan may wear a similar white robe at weddings and at prayer services. In Jewish Mysticism, wearing a thin red string (as a type of talisman) is a custom, popularly thought to be associated with Judaism's Kabbalah, in order to ward off misfortune brought about by an "evil eye" ("עין הרע" in Hebrew). In Yiddish the red string is called a "roite bindele".
Color reaction Color reaction In chemistry, a color reaction or colour reaction is a chemical reaction that is used to transform colorless chemical compounds into colored derivatives which can be detected visually or with the aid of a colorimeter. The concentration of a colorless solution cannot normally be determined with a colorimeter. The addition of a color reagent leads to a color reaction and the absorbance of the colored product can then be measured with a colorimeter. A change in absorbance in the ultraviolet range cannot be detected by eye but can be measured by a suitably equipped colorimeter. A special colorimeter