Masking can be either as simple or complex as you want it to be. For anything serious you need a
registration contact frame and matching punch, but rarely a registered carrier. The problem with
older literature is that all the relevant films have since changed. One of the best kept secrets which
hasn't changed for basic work with just black and white printing is neocrosin red dye. A tiny jar will
last you a lifetime and allow quite a bit of experimentation without even the need for masking if what you are interested in is simply automated dodging and burning. For enhanced microcontrast or
improved edge effect you need real unsharp silver masking.