* Chemical Reaction: Metallic dyes contain metallic salts (like lead acetate, silver nitrate, copper sulfate, etc.). When bleach (hydrogen peroxide) comes into contact with these metallic salts, it can cause a severe chemical reaction.
* Damage: This reaction can:
* Fry the hair: Cause extreme breakage, melting, or disintegration of the hair shaft.
* Cause severe heat and burning: The reaction can generate intense heat, potentially burning the scalp and hair.
* Discoloration: The hair can turn unpredictable colors like green, blue, or even burn black.
* Unpredictable Results: Even if the reaction isn't as severe as melting, the outcome is highly unpredictable. You have no control over the final color or the condition of your hair.
In Summary:
Do not bleach hair that has been dyed with metallic dyes. The potential for severe damage and dangerous reactions is too high.
What to do instead:
1. Determine if it's a metallic dye: If possible, find out the dye brand and ingredients. You can also do a strand test (mentioned below) to check for a reaction.
2. Consult a professional: A professional hair stylist experienced in color correction is your best bet. They can assess the situation, perform strand tests, and determine the safest course of action.
3. Alternative removal methods: A stylist may recommend using color removers (designed for oxidative dyes, not metallic dyes) or toners that can help neutralize unwanted tones. These methods are generally safer than bleach, but still require careful consideration.
4. Patience: Removing metallic dyes takes time and may require multiple appointments. Be prepared for a long process.
5. Strand Test: If you are unsure if the dye is metallic, perform a strand test on a small, hidden section of your hair before applying any chemicals to your entire head.
Remember, your hair's health is paramount. Don't risk permanent damage by attempting to bleach hair with metallic dye. Always seek professional help.