guessing you'll not have certified you will use a batch of cresyl fast violet...seeCONN'S Biol. Stains, 10th ed). Also guessing you will use the stain on deparaffinated brain sections, or would you like to stain resin sections?? Only "pure Cresyl fast violet" or perhaps combined with a Golgi (silver impregnation) stain?
For paraffin sections there is given a recipe in BANCROFT & GAMBLE, Theory and Practice of Histological Technques, 6th Ed,2008 (Churchill-Livingstone/Elsevier)
for the combination of CFV + Golgi-stain/impregnation I recommend (chosen randomly):