No greys for body text
The specification says it outright and the measurement agrees: fifty per cent grey on the silver chassis is 2.17 to one. Black is the only body colour, and the grey exists for the bevel's dark edge.
That is the whole interface language of the era, and it is a real affordance: the bevel tells you what is pressable without using colour at all. White on the top and left, grey on the bottom and right, inverted the moment you press.
The specification says it outright and the measurement agrees: fifty per cent grey on the silver chassis is 2.17 to one. Black is the only body colour, and the grey exists for the bevel's dark edge.
Lit on the top and left, shadowed on the bottom and right, inverted on press. It says "pressable" without colour, which is more than most modern buttons manage.
Pure red on the silver is 2.20 to one. On the white and yellow panels it is fine, which is exactly where this era actually used it.
Placeholder figures — not an offer
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