I have to confess Scented I didn't measure the amount of fragrance that I used, just a small dribble of it. As I stated in the first post this FO uses 15ml (3 teaspoons ) for 5 kilos of wax (over 11 pounds weight). I used a metal tin for the container. The plastic cup was just a trial and to use the last of that sessions wax. I added the FO at 180 f just prior to pouring. Janette, I did leave the lid on overnight, but it's hard to think where all the moisture came from, there was a good teaspoon full. The tin BTW is 2" deep and 1.5" square. As a matter of interest these 2 items where the only ones in the sesion that I didn't water cool. Thanks for your replies, I'm most grateful. Ian