I have some old hermetically sealed glass diodes that have a blue color under the glass, which is different from the red ones that I normally see. Does anybody know what the difference between the red colored ones and the blue ones is if there is any? Maybe they just randomly chose the colors, but I feel like there must be some difference...
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\$\begingroup\$ Are you sure it's actual glass? Could you provide a photo? \$\endgroup\$– Dmitry GrigoryevCommented Jun 22, 2016 at 7:11
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1\$\begingroup\$ @DmitryGrigoryev I think he's talking about that kind. I never saw blue ones, though. \$\endgroup\$– dimCommented Jun 22, 2016 at 7:23
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\$\begingroup\$ Thanks, I have misread the title as "red glass" and "blue glass" diodes. Regarding the pictures you've found, I alsways assumed this shade of red was the color of raw copper. Never saw blue ones either (don't know any widespread blue conductors), so I still hope to see a photo from the OP. \$\endgroup\$– Dmitry GrigoryevCommented Jun 22, 2016 at 7:28
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1\$\begingroup\$ @DmitryGrigoryev To be honest, it took me some time to understand too. I even initially thought he was talking about LEDs. \$\endgroup\$– dimCommented Jun 22, 2016 at 7:35
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\$\begingroup\$ I could toss you some blue and dark brown ones into the mix. It is just whatever the manufacturer happened to be manufacturing it with. There is no colour coding or anyhting. \$\endgroup\$– PlasmaHHCommented Jun 22, 2016 at 8:51
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