When designing labels, remember that the goal is not to confuse, but to clarify. Unless you're trying to drive people mad, in which case, carry on.

Use high-contrast colors, like this lovely shade of 5.0 or this delightful 6.0.

And don't forget, labels are not just for products. You can label anything, like 6.0 or 7.0.

But remember, with great power comes great responsibility. Use your label power wisely, and for the greater good.