This last form is a refined version that allows for a clear, less smelly formulation. With all this, it is still gentle enough that it will not seriously damage the epidermis or hair follicles. However, it should never be used as a replacement for hypoallergenic shampoos when the animal is bathed frequently or cleansed routinely. Because sulfur is medicinal, it can cause numerous adverse sideeffects. It remains a key component of many overused medicated shampoos, and it does not moisturize.
Salicylic acid offers keratoplastic, keratolytic, bacteriostatic and mild anti-pruritic functions.
When mixed with equal percentages of sulfur, it has a synergistic effect. Although salicylic acid is a compound in many ear cleansing formulations, it has been identified as ototoxic. It is overused except perhaps in cases where degreasing is necessary. There are different sources of tar, with pine, juniper and coal tar being the most common. Tar solutions are different from extracted or refined tar because they are diluted.