Acorn's line of ARM-based Archimedes computers was common in UK schools in the 1990s, and many classrooms had an A3000, A4000, or A5000 computer.
The function keys of the A3000 were a distinctive red colour:
(image from Wikimedia Commons)
The A4000, and A5000 (pictured), had dark grey function keys, similar to PC keyboards:(image from Wikimedia Commons)
Why was the A3000's keyboard so colourful by comparison?