How can we best use a methyl violet solution (0.5%), used in Candidia alb. Infections, prepare?

The solubility of methyl violet in water is 1 to 20. Now it is usually replaced by gentian or Crystal violet, which is used as a 1% solution for Candida Albicans. The solubility of this product seems to be highly sensitive to its purity. The pure product has a solubility of 1 to 200. A 1% solution can be prepared if adding 10% alcohol. Gentian Violet is also well soluble in glycerin 1 to 30 so that addition of glycerin can also be considered. A 0.5% solution should therefore be feasible. Maybe give it a try with an addition of 10% alcohol as done for the 1% solution.

reaction
We prepared the 0.5% methyl violet solution and let it stand overnight to settle any insoluble. We have opted to add 10% alcohol and the solution has become completely clear.