Correct Byron. It has always been an unknown one. Basically I dont know if anyone else has proof. That the colours changed at all..... Yes what they where called did change. But where the colours any different? Or did what people see the colours as just change so be called something less confusing. Its a very odd one.

Basically I have never seen any of the "blue green" ones. So that makes me wonder did they ever exist. Also lets say yes they do exist. Now we have the issue of what colour is "blue green"

1979 sandmans did not use the DY4 on some colours and instead used DX5. But there was some that did have the DY4.

I think honestly this is going to be an impossible one to proove. Unless GMH would co-operate. haha... Dreaming....

This is what has made me just go with the colours Dark blue/mid blue/light blue as this is what 99% of people reconise DX5 HZ as.

Happy to be proven wrong.