Use
B is best added to working strength A shortly before use at around 20°C. The ascorbate dissolves immediately, the Phenidone more slowly; crush any small lumps before adding. If left standing for a few minutes, the powder is penetrated by water and dissolves more easily.
A keeps indefinitely in a closed container. The combined A+B has a short working life. Unused working solution will keep its properties for a maximum of 36 hours, if kept in a closed container. Use the working solution once, then discard.
Stock solution may be made up in tap water though 'purified water' is preferred as helps with the short stability of the working solution. Do not use battery top-up water.
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