For the small but significant minority of males that are colour blind, avoid using the colours that are more commonly confused to describe climb grades or style. Like red and green, ok to use 1 but not both.
Provide an alternative if you can't tell the colours apart like additional cross hatching or shapes. For example skiing and MTB runs use Green Circle, Blue Square and Black Diamond. If you can't pick the colours you can hopefully tell the difference between a circle and a square. |