What is the appropriate way to mark on my pouches the date and load number of sterilization?

A soft graphite pencil may be carefully used prior to loading the sterlization pouch on the paper of the pouch. Indelible marker may be used on the poly side of paper/poly pouches. If indicator tape is used pencil or marker can be used on that. Never use magic marker on the paper side of paper/poly or all paper pouches. The ink may bleed through to the instruments thus contaminating them.