Potential dangers

Potential dangers

The search for new ingredients and products often brings controversy, typically over ingredients whose function is unproven or disputed.^{[citation needed]}

There are few potential dangers regarding the use of cosmetics. One such danger is the use of old mascara. Some mascaras contain an ingredient that breaks down to produce formaldehyde. The formaldehyde prevents the growth of bacteria. Aged mascara, however, may no longer be producing formaldehyde, allowing bacteria to proliferate. For this reason, it is often recommended to replace a tube of mascara every few months .^[17][18]

In one well-known case, Buddy Ebsen was originally cast as the "Tin Man" in the The Wizard of Oz. Aluminium dust was used to create a tin effect. As the result of an allergic reaction, he was hospitalized and Jack Haley replaced him. Aluminium dust was, instead, added to a paste