The addition of UV absorbers is only necessary when the product is likely to be exposed to UV light - as is the case when it is marketed in a transparent pack. There is no need for UV absorbers in products that are sold in aerosol cans, nontransparent jars, or tubes. If cosmetics that have been packed in this way should, nevertheless, show a change in shade, the reason is frequently to be found in an incompatibility with other ingredients.