I love menthol and have read many post regarding making menthol drops. I think the best advise on making menthol or em drops was from DAN. He taked about repeatable results. This makes a lot of sense to me. You can desolve as many crystals in a liquid as you can and I don't think it will make a lot of difference how exacty you do it . However, making a solution that you can repeatly make time after time is valuable. So that your recipes will not change from batch to batch depending on the consentration of menthol or EM you are using.