I would void to put -none heavy product on a letter. In the case of letter, AE would give better result, than PI. NPA:cologne 1:5 would give good result, just do not put a drop of cologne, for a letter,after one hour, I will say, 0.2 drop of NPA:cologne. In a case of AE, 0.5 drop.
Even better result would give SOE. The best on letter, teddybears, flowers, is a pure -nol from chemset.
Wait to another opinions, maybe I am wrong.
Good Luck!
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