> On Nov 4, 2016, at 9:19 AM, Sam O'nella <baryth...@gmail.com> wrote:
>
> Out of curiosity and ignorance what's with the solder joints on the cards in
> the pictures? That orange color seems like it's everywhere around cold
> looking solder joints. Is that rust, some sort or protection, or acid
> corrosion?...
>
>> The Altair 8800, a very early one, 4-slot motherboard, 1K ram, ceramic CPU,
>> you will see: https://goo.gl/photos/3C1pzfwFoZ3koPgt9
I doubt it's any of those. That's the typical look of a board hand-soldered
with conventional rosin core solder. While it's possible to remove that flux
(thought I think the best solvents are non-PC), it is often omitted and
generally not needed.
paul
