colours again

[emperor]

still trying to find answer to quiz question as asked last week.Thanks for answers but the only one that looked right was 'black' and 'green' but what does it mean?The question again is:-

if 25 is purple,22dark blue,13 grey and 1 crimson waht colours are 17 & 18

[Alibobs]

Is it airfix paint numbers?

Or painting by numbers.

Didn't see last week's post so sorry if I am duplicating

[emperor]

thanks alibobs but I have tried both those suggestions and can't make them fit

Any other suggestions most welcome

[emperor]

The answer is supposed to be postage stamp colours but the compiler now admits the question was set before recent price increases!!!
17 = green
18= bluish violet

Thanks anyway