The mandelin reagent is naturally a strong yellow colour due to the presence of vanadium oxide, but most of the other reagents are colourless or close to it.
- Mandelin: Strong yellow
- Marquis, Froehde, Liebermann, Mecke: Pure white
- Ehrlich, Hofmann: Slight yellow
- Morris: Slight pink
If your reagents are showing another colour, especially dark colours like green or black, it suggests that they have been contaminated or have expired. Test a benadryl tablet or other legal substance that gives a known colour change to verify the situation.
Our unique formulation means that we are fully compliant with all UK laws and require no special registration or licences to use. (Most non-UK suppliers sell liquid reagent tests which are not compliant with the Offensive Weapons Act 2019.)
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Definitely! We love helping people interpret their results.
It will produce a mixture of the colours – a lot like mixing two colours of paint. If you have a powder or crystalline substance with two different looking types of crystal, try to separate them and test them individually.
Use aspirin, paracetamol or ibuprofen to see if you get a colour change. Different tests go off at different speeds.
About 12 months if the lid is properly secured and they are kept in the fridge. They last about half as long if stored at room temperature. Temperature, moisture and oxygen all affect shelf life.
