[shep53]

All marking fluids are supposed to be scourable and i have never had any deductions from the wool board, don't know about home proccesing , my scanner only uses fluid .  Numbers are often put on to sale rams or pedigree ewes using gloss paint as it doesnt spread and drys faster then marking fluid . Personaly i use  fluid / spray cans / crayons depending on the length of time i need the mark to stay