Two fast questions:
im thinking about making NG with 58% HNO3 and 98% sulfuric, i thought about making in an icq bath, but considering the freezing point of the glicerine is just 13,5°C won't i likely get frozen nitro as result?

How to concentrate HNO3, i thought about boiling it, but it won't be efficient, trapping the water with sulfuric and distilling could be done but is time consuming and i don't have distillation equipment, what about freezing it?

How about reading the NG thread and the whole HNO3 section??? info you need it all there, you just need to find it.

It's not to hard to answer your questions but there is no point in doing so since the answers are avalible alreay.