A company in Japan sells a powdered mix that is used in Gokum(?) films. It should be fairly easy to find.

As far a using Pina Colada mix your best bet is to buy Bacardi brand, open then reseal the bottle and put it in the back of your refrigerator. In about 4 weeks it should have the perfect color for use as fake cum.
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I'd rather be ignorant than stupid. Ignorance implies a lack of knowledge which is easily correctable through education. Stupidity implies an inability to learn. Therefore; ignorance is temporary, stupidity is forever!