I'm not familiar with this brand but I'm surprised it's so short lived. Basic tints are all much of a muchness to be honest. I bought every blueblack tint I could find a few years ago and none were rubbish.
I have had a complaint that a new therapist gave a short lived brow tint - she's not with me any longer so I'm not sure what she did, but I retinted with the same products for the usual 2-3 weeks. I'm wondering if your technique is at fault.
I've got most of the belmacil colours and I liked them, but I didn't find them amazing - I do like their red though, it gives a lovely result added to any of the brown tints.
For long lasting colour I've switched to henna. It's potentially dangerous if you don't a brand that has complete control of their source of supply - due to the problem of product adulteration with toxic products which happens in lots of developing countries in products as diverse as cement and baby milk. Luckily, I trained in a brand that grows its own supply and built its production line by the field so nothing leaves until it is made up in sealed product containers.
I'm half Indian so I have black brows that shrug off all tints overnight! (A quirk of my ethnicity) Henna darkens my brows do that I don't need to bother with make-up and it gives a lovely glossy shine that really enhances my brows. I've been so impressed.
