upside down on paper sheet.
A wide mouth reagent bottle is used to store compounds. These compounds are mostly solids or those that are very thick in consistency.
Because it is unstable after it hit light.
Some solvent or chemicals are sensitive to light, and they get oxidised when they are exposed to it.
Reagent bottles, also known as media bottles or graduated bottles, are containers made of glass, plastic, borosilicate or related substances, and topped by special caps or stoppersand are intended to contain chemicals in liquid or powder form for laboratories and stored incabinets or on shelves.
Reagent bottles are containers made of glass or plastic, and are closed by special caps or stoppers, and are intended to contain chemicals in liquid or powder form for laboratories and stored in cabinets or on shelves.
Not all reagent bottles are glass. Bottles for Hydrofluoric acid are plastic-- it will eat through glass! Some Reagent bottles are polypropylene. The glass-stoppered ones that used to be some common in labs were because they didn't have the plastics they do now. Many nasty acids, like concentrated Nitric, will dissolve most bottle caps--rubber, cork, steel, etc. The loose ground-glass stoppers are inert to most acids and alkalies, and also don't contaminate the reagent. Picric Acid, for example, used to be readily available; it wasn't too corrosive but would produce a sensitive high explosive if exposed to copper and some other metals.
This amber/brown color is one of many pigments that are used to prevent ultraviolet (UV) light from penetrating the chemical reagent's bottle and damaging a photosensitive chemical. While there are some molecules that are affected (often very little) by the visible spectrum of colored light, UV-light is the primary range of the electromagnetic spectrum that can catalyze unwanted reactions in bottles which effectively degrades the reagent.
To ensure no other chemicals get into the bottle and react with the solid you are trying to use.
tollen's reagent = [Ag(NO)2]+ baeyer's reagent= KMnO4
Formaldehyde schiffs reagent Formaldehyde schiffs reagent
nessler's reagent