What’s the purpose of a colloid mill in camphor production when preparing camphor-based liniments or creams?

In camphor production for topical formulations, a colloid mill helps evenly disperse camphor crystals or camphor oil throughout a cream or liniment base, preventing localized high concentrations that could cause skin irritation and ensuring consistent cooling or analgesic effect across the product. The controlled shear also helps stabilize the mixture if other actives or waxes are included in the formula.