On 11/4/16, 7:22 AM, "cctalk on behalf of Paul Koning" <cctalk-boun...@classiccmp.org on behalf of paulkon...@comcast.net> wrote:
> >> 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 > > Yes, looking at those pictures that¹s rosin.