Orange G (CAS 1936-15-8): storage and disposal

A jar of this size arrives in a screw-cap bottle that can sit at the back of a cabinet for years. As general stock it needs only a dry, labelled, well organised store, away from damp and with the date of receipt on the label. The tracking-dye role means it is often split into a small working bottle for the gel bench, which is where labels get lost, so keep the original jar as the record and label any portion clearly. Separate it from food grade colourings or supplies in a shared prep area, since an orange powder in a plain jar is easily mistaken.

Orange powder that stays dry and runs freely behind a clean cap is the normal state. An orange stain on the thread, label or shelf shows the seal has been leaking, and a label stained orange until it cannot be read leaves an unknown jar. Lumps or a damp, tacky texture mean moisture has entered. Beyond these checks, the dye gives few visual signs of age, so rely on the container and the record: no date of receipt, a cracked jar, a stock entry that no longer matches. Do not open an unlabelled orange jar. List it as unknown and leave it sealed.

By specialist collection only. It never goes down the drain or into general waste. It is normally packed in a non-regulated or low hazard laboratory pack with compatible chemicals.

This dye leaves the site by collection. Although it is not classified as hazardous on the sources we checked, it stays a chemical waste needing an accurate description, so it is not put into a sink, a drain or the general bin and nobody should attempt to treat it. The code for a university or laboratory store is 16 05 09, and 18 01 07 where a human healthcare service is clearing it. Say it is powder, give the jar size, mention any split working bottles and list jars in poor condition separately.

Usually held as: solid.

Part-used bottles and full containers are both fine. Tell us the size and how many, and an estimate is enough for a first price.