Hi Ian
I included it in my teaching programme last year, if you have a nice grainy
texture tone positive it is ok, but however still a very difficult process
to work, the fact that we are not doing it this year speaks for itself.
Get to grips with GB first,that is if one can ever really get to grips
with that elusive process { humble grovelling apologies Judy I just could
not help it } :-) then try it.
If you need anymore info please get back to me pete