PPD (paraphenylenediamine) is the ingredient behind most permanent hair colour allergies — and most people don't know it's in their hair dye until a reaction forces the question. Here are the answers we get asked most.
What is PPD, and why does it matter?
PPD is a synthetic dye compound used in almost all permanent hair colours because it's cheap and gives long-lasting, vivid colour. It's also one of the most common causes of allergic contact dermatitis from cosmetics — scalp burning, itching, swelling, and in some cases more serious reactions.
Does PPD-free mean the colour won't last as long?
It means the colour behaves differently, not worse. PPD-free formulations rely on alternative dye systems, so expect a slightly different fade pattern and refresh schedule rather than assuming it underperforms.
Is PPD-free the same as "natural" or "herbal" hair colour?
No — and this is where a lot of marketing gets misleading. A product can be PPD-free and still contain other synthetic dyes or harsh chemicals. PPD-free is a specific claim about one ingredient.
Who should specifically look for PPD-free colour?
Anyone with a history of scalp sensitivity, previous reactions to hair dye, or who colours their hair frequently enough that cumulative exposure is a real concern — not just people with visibly sensitive skin.
Can I do a patch test even with PPD-free colour?
Yes, and you should. PPD-free doesn't mean allergen-free; other ingredients can still trigger a reaction in a small number of people. A patch test 48 hours before full application is still the safest habit.
Will PPD-free colour cover grey hair effectively?
Grey coverage depends on the dye system and technique used, not on the presence or absence of PPD specifically. A well-formulated like ours , a PPD-free product can cover grey effectively.
How is this different from a demi- or semi-permanent colour?
That's a separate variable — permanence and PPD-content aren't the same axis. You can have a permanent PPD-free formula or a semi-permanent one containing PPD. Check both labels separately.
