I'm an educator, and I've never heard of testing children in schools for colour blindness, at least here in BC. However, I grew up in Saskatchewan, and back then they may have. We had a ton of art education (which I loved), with only primary colours, black, white...(the ones shaped like hockey pucks...the ones that David and I snuck out to the rink during recess, taking slap shots ala Bobby Hull, against the boards... left a very colourful mess, to which we got strapped for
. It was David's fault) . Anyway, there may have been some secret testing on us going on in the background. I do remember mixing up the three primaries and getting a colourful black...After that, everything was painted black.
That' how I get my blacks for gum printing...

