This has a couple of answers, like 08:61, or 09:01
, the majority of observers with red-green deficiencies see the number 73. The majority of observers with normal colour vision see nothing at all! This is because NORMALS sense of colour is actually masking the subtle brightness differences which colour deficient observers use to see the numbers.
so one step forward all you 'orrible deficients
sorry, forgetting myself just for a second, as you were.