Black hair dye. 😭

I have a problem... I'm addicted.

Addicted to dyeing my hair black.

I think the first time I dyed my hair black was when I was 13, and I'm 18 now. No matter how many different colours I've tried, I ALWAYS end up going back to black because I genuinely feel like it's the colour that suits me best.

BUT there's a huge problem 🥹...

My hair literally spits out hair dye SO fast because it's really porous, so colours never last on me. Not even permanent black dye. Within just a few weeks, my hair is already turning brown again.

To be fair, I've had a keratin treatment (my natural hair is super curly) and I usually straighten it around 2–3 times a week, but I always use heat protectant and try to keep the temperature as low as possible.

I've tried EVERYTHING to make the colour last longer: washing my hair with cold water, using heat protectant, taking extra care of it, etc. BUT NOTHING WORKS 😭😭

So I'm looking for recommendations for hair dyes that are REALLY black. Like, insanely deep, intense, almost blue-black, and long-lasting. Preferably brands I can actually get here in Spain.

Because at this point I'm genuinely considering shaving my head and just living in wigs.

SEND HELP. 😭