I can't post a picture, since I don't have a good camera.
I've noticed white powder on leads of some components. What could it be?
I'm sure that it isn't just dust, because there isn't any on the component bodies and was on some components which were stored in their own sealed bags.
I've seen it on all types of components, but not all components have it. I was unable to find any mention of it in any datasheets. I've seen in on for example Fairchild DB237 transistors, Piher potentiometers, various no name resistors and so on.
I did notice that most components which have the powder have flat leads.