That is a 50% wt/vol solution. It is certainly ok, but very strong. It is by no means 100%.
I knew you would say that, thanks for the clarification.
It is a strong sol. so a little goes a long way, but it certainly beats having mould (mold?) in Part A. Some people put Formalin in their gum mixture so I think the 50% thymol sol. is a better alternative.