Just read the formalin details, properties and will get Idea of making kit of it.

Formaldehyde may be detected using the following reagents:

1. Phenylhydrazine hydrochloride + acidic hexacyanoferrete (III) (pink or purple color, color intensity is proportional to formaldehyde amount).

2. Phenylhydrazine hydrochloride +acidic Potassium hexacyanoferrete(III)(pink or purple color, color intensity is proportional to formaldehyde amount).

3. Almost same as previous, addition is impregnation of Silica gel.

4. 3-methyl-2-benzothiazolone hydrazone (MBTH) + acidic Iron (III) Chloride (Blue). [Note: highly acidic condition; pH