Doing a little maintenance around the shop, decided to change the jointer b lades. 6 to 8 months ago, I had 2 sets of blades sharpened and rolled the m in the blue shop towels, for storage.
I discovered all the blades have developed rust spots. I suppose the towe l's acid caused the rusting. The towels were stuck to the blades at the points of rust. There was no signs of any discoloring/blemishing on the o utside of the wrappings, so I doubt the cause was from an exterior contamin ate, migrating inward.
Scroll right for 2 more pics.
I have older sets of blades wrapped in regular paper towels and in brown pa per bags... no rusting on these.
I had planer blades sharpened at the same time as the jointer blades. Pla ner blades were stored in their designated cases. No rust on these, so wh atever caused the rusting didn't come from the sharpener.
Sonny