You can do it alone or with NPP. If you do it with NPP make sure you reduce the mg/ml ratio to about 75mgs. This will keep it in solution.
They are both short esters and will be fine together. If you make them separate use the TP recipe for the test acetate and light oil, 2% or less BA and 8% or less for the NPP and do not exceed 100mg/ml or it will crash. I say this because the NPP being produced lately is not pure and has a chemical that will start to form fibers/crystals in solution above 100mg/ml.
I did:Test acetate 75mg/ml / NPP 50mg/ml with 2% BA, 20%BB in sesam oil.
When I mixing with oil, crystals start to form and took 1 hour to dislove completely (baker in hot water).
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