Sheluma

I was wondering the same thing. I would think that if it is different it is more refined now than it was then. But your White is from that era, so it was probably well refined at that point. I'm guessing that a low grade petroleum jelly would have particulates or be a different color, and you'd be able to tell by looking at it. Actually, now that I think of it, some of the Singer lube I've seen (newer stuff, in white and red plastic tubes) is an amber color and I'm wondering if it's not as good as petroleum jelly.