[Kell]

About the blue color and color-blindness problem...

It depends on the colors badges can be, apart from blue. If they can be yellow or green... that might be a problem because of tritanopia and tritanomaly. But I only know of blue and orange badges. So true... those orange badges might appear red to someone with tritanopia... but he's not going to mistake a blue badge with an orange-red one.

You are still right for the fully achromats out there. But a shading level difference between the orange and the blue badge could be enough. Otherwise, a simple indicative letter is enough (E for employees, I for interns and C for contractors would be more than enough).

Again... if there are more than two colors for those badges (green, yellow, red?) the problem of relying on color to convey information could be more problematic.

[vacri]

You are still right for the fully achromats out there

If you're catering to the extremely rare achromats, there's a heap of accessibility options you should be considering first, including braille for blind people.

[r00fus]

> If you're catering to the extremely rare achromats, there's a heap of accessibility options you should be considering first, including braille for blind people.

In the general population, blind people may outnumber achromats, but in the tech worker population, I'd say that relationship is inverse.

An achromat can usually manage to be productive in an office setting, often without alerting others to their condition.

Blind people have it much much harder and thus are less represented at a large tech firm like Microsoft.

[renata]

Red and green exist for sure (red for "Not really a badge", green for a-dashes if I remember correctly).