I think Blck changed the system subsequent to @Hooked's delivery.Hmmm, the Blck website says that 10% is the recommended mixing percentage, which means 100ml from a 10ml bottle. Did you use the whole 10ml in the mix? If so, it might be a tad strong.
On the website, they say:
So it's a bit unclear whether it's supposed to be 60ml or 100ml.