Harsh chemical colors can adversely affect your health in several ways:

1. Eyes: Chemicals like ammonia and hydrogen peroxide in hair dyes can irritate and damage the eyes if they come into contact during application.
2. Hair: Chemical dyes can strip hair of its natural oils, leading to dryness, breakage, and in some cases, allergic reactions or scalp irritation.
3. Skin: Harsh chemicals in hair dyes can cause allergic dermatitis or contact dermatitis on the scalp, ears, neck, or forehead.

To minimize these risks, consider using natural or ammonia-free hair dyes and always perform a patch test before applying any new product to your skin or hair.

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