Hi - Different skin types have varying degrees of DHA sensitivity but you can usually expect to see results fairly quickly. After four hours the tan would have developed nicely but you should advise your clients to avoid washing for at least 6 hours to allow the DHA to penetrate the epidermis and ensure the longevity of the tan.
With regards to staining, aside from clear solutions most tanning fluids contain a cosmetic bronzing agent (often referred to as guide color). This gives the appearance of a tan straight away (albeit cosmetically) and provides a convenient visual aid during application. It’s best to avoid contact with delicate fabrics like silk but other than that you will be fine
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