What is the main safety consideration when using hair color?

The primary safety consideration when using hair color is avoiding allergic reactions and skin irritations. This is crucial because many hair color products contain chemicals that can provoke allergic responses in some individuals, potentially leading to skin rashes, irritation, or more severe reactions. Conducting a patch test prior to applying the hair color allows for the detection of any allergic reactions, ensuring the client's safety during the coloring process.

While the other options touch on aspects of usage and convenience—such as eco-friendliness, using gloves to prevent staining, and mixing colors outdoors—they do not address the direct health risks posed by the product itself. Protecting the skin and ensuring no adverse reactions is paramount in any hair coloring procedure.