Drying Lime Sulphur in the Winter

I was looking for a tip on how to ensure that Lime Sulphur dries and turns white in the Winter.

I have a tree that I'm hoping to show at the BSA event in March but it needs a little work on the deadwood. What I've found before is that applying Lime Sulphur in colder, damp weather doesn't have the desired effect. Anyone got any "tricks of the trade"?

Many thanks in anticipation,
Regards,
Simon

Monkey, a light painting with vinegar or a heaver application 50:50 vinegar\water will whiten it quickly. Same thing on newly placed copper wire before a show. It will darker the new wire'
Wood

Just to be absolutely sure here, do you mean applying the vinegar or vinegar/water solution on top of lime suphur or instead of it?

Fiona, on top of the lime sulphur.
Wood

Bringing it inside then turning a fan on at high speed will also help.