If
you fill the NPA bottle to the 5ml-scale with 1ml NPA then it remains 4ml for the cologne which means it is a
4:1-mix! But as the NPA bottle can filled with about 7ml when filling to the upper limit it would be an 6:1-mix!
Depending on the cologne it would be a good mix! If I apply NPA and Kouros in a mix, I prefer a ratio of 1 part NPA
and 2 or 3 parts of Kouros with great results! But keep in mind that Kouros is a very strong cologne. An 2:1-mix
with a weaker cologne could stink! A other good mix is P6 and NPA! There I prefer a ratio of 1 part NPA and 6 parts
of P6! It works great too!
Your other question: The spray from an atomizer varies between about 0.05ml and
0.15ml! Supposed you atomizer spray an amount of 0.1ml and you use an 4:1 ratio, one spray is approx. 0.02ml NPA
which contains about 4.8mcg Androstenone! Try one spray at first, and then perhaps raise to two sprays!
Good luck
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