8 3/4 A-body rear teardown after 45 years outside

Well its Another night of beating my knuckles down but I got the 45 year old A-body 8 3/4 rear that sat outside apart and ready to pull the center chunk....The dam axels just didn't want to come out peacefully and I don't have a puller or even a drum so I pounded the **** out of the backing plated woth a rubber mallet till they gave in and came out....what do the white marks on axels mean??

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looks like a paint. more than likely they are a factory marking of some kind, probably an inspection or a certain line they were meant to go too.