black walnut powder?

[Anje]

The "up to 8 washes" ones don't contain any; the "up to 24 washes" ones do. (That INCI you posted must have been of a 24 washes one, as I have used the up to 8 ones many times, and I know they don't contain it.) It's a bit confusing as they call both "non-permanent", so you need to check carefully which one it is, but the up to 8 washes ones have slimmer packages (as they only contain one bottle, i.e are deposit-only)

I'm pretty sure that was this one. 8 washes, contains PPD. It's usually the darker colors.

[Rosetta]

I'm pretty sure that was this one. 8 washes, contains PPD. It's usually the darker colors.

That's very strange, as I've used some of the blondes, light browns and medium browns of that series, and they haven't contained any (I'm meticulous in checking the ingredients these days)...! Unless they have made an error in the INCI listing there on that site. But if not, at least I know to stay away from the dark browns

[Anje]

I'll bet it's mostly because you've been using lighter colors. PPD is blackish, so you're more likely to get it when you're choosing dark colors, and likely at a higher dose the darker you go (though that's a guess).