I agree. If you had a higher hardness the color would be more intense, simply because you had a higher proportion of test liquid to water.
That I can also relate to. So, overall my GH is extremly weak and I realize I will need to get it up a bit. I'd like to match it out basically to my KH @ 3-4 ppm........ Our Water here is
pretty soft out of the tap @ around 7.0