Why are nail technicians taught to NEVER mix leftover liquid monomer from a used dappen dish back into the original bottle?
Explanation
Once monomer has been dispensed into the dappen dish and used at the chair, it has picked up polymer powder, file dust, bacteria from the brush touching skin, and atmospheric moisture. Pouring it back into the stock bottle inoculates the entire bottle with contaminants and contaminates the next client's dish, and the trace polymer begins to thicken the supply. The professional practice is to discard the dappen dish contents, clean and dry the dish, and dispense fresh monomer for the next client. California licensees follow this under general sanitation duties at CCR Title 16 §979.4. Options A, C, and D state reasons that are not the actual sanitation rationale.
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