Can I use this on hair that's been recently lightened, permed, or chemically straightened? — Hair Color Shampoo "Chestnut", 40 ml – Victoria Beauty

The source explicitly advises caution if your hair has been recently lightened, permed, or chemically straightened. These processes alter the hair's porosity and protein structure, making it absorb pigment unevenly and often more intensely. On freshly lightened (bleached or high-lift) hair, the chestnut shade may turn out darker, warmer, or even slightly greenish if the underlying pigment is yellow — the chestnut formula likely has a warm base that interacts with residual yellow tones.

On permed or relaxed hair, the cuticle is more open, so pigment grabs quickly and can look patchy or overly intense on the most damaged sections. The result may also fade faster because the hair can't hold the pigment as well.

Wait at least two weeks (preferably 3–4) after any chemical service before using this shampoo. Always do a strand test on a hidden section first: apply, time it per instructions, rinse, dry, and check the tone in daylight. If it's too dark, too warm, or uneven, you'll know before committing to a full head. If you're unsure, consult your colorist — they can recommend a toner or gloss that's formulated for chemically treated hair.