Does hair dye expire?

Yes, hair dye does expire. Companies are not mandated to place expiration dates on cosmetic products, but many choose to indicate a shelf-life expiration date and an opened expiration date on hair dye packages. Unopened hair dye is generally recommended to be used within 3 years of its manufacture date. Once opened, the dye's lifespan depends on factors like storage conditions; however, most dyes last about 6-12 months after opening.

Expired hair dye can lead to reduced effectiveness, altered color, and may cause skin irritation or allergic reactions due to changes in the chemical composition. The industry uses a symbol resembling a cosmetics container with a number to indicate the months after opening until the dye expires.

If you're unsure about the expiration date or if the dye has been stored properly, consider the sensory test: check for any changes in smell or appearance, as these may indicate spoilage. It's best to discard expired or potentially compromised hair dye to avoid any potential negative effects on your hair and skin.