Phosphates give a yellow crystalline precipitate upon addition of HNO and ammonium molybdate.

A yellow precipitate of the metal acetylide is formed in this case.

If Denigés' reagent is added to a solution containing compounds that have tertiary alcohols, a yellow or red precipitate will form.

It is usually generated as a fine yellow precipitate by treating a solution of hexachloroplatinic acid with a solution of an ammonium salt.

The chloride reacts with the lead to form a bright yellow precipitate, PbCl2.

A yellow precipitate should form immediately.

If not, the reagent is too acid and a further gram of mercuric nitrate added to produce a slight cloudiness should produce the yellow precipitate.

A positive test is signaled by a yellow, orange or red precipitate (known as a dinitrophenylhydrazone.)