How should I store YES products?
As YES products are made from natural ingredients, they are more sensitive to harsh conditions than their synthetic chemical cousins (actually more distant than cousins). Do not leave them on a sunny window sill, keep them at room temperature, no freezing or boiling and keep the lid on when you are not using them. They are not too sensitive, so you don’t have to turn out the light although they do like a little candle light!