Blue Shadow Rolls
These paper rolls were highly impregnated with a wide variety of chemicals. If used as emergency bog rolls they had very painful effect on nether regions. Personal experience on 249 (GoldCoast) Canberra B16s.
Also had to be kept in sealed plastic tubes til needed for use because if dried out were even more useless than normal.
If injudicious use of dividers to measure distance of returns (to Stbd only), then the 1600v sitting on the writing bar certainly removed the euphoria of operating cutting edge equipment.