Is this a standard color? Because I have bought several sets, I don't know if it is a problem with different manufacturers, and I found that the Color is different.
I read this, and the final judgment is still a little vague. There are 1-7 grades. How to define which grade it belongs to, and which grade is complete to what extent. I didn't explain it in detail.
"Paints and varnishes rapid deformation (impact resistance) test, Part 2: Drop weight test (small area punch) " GB/T 20624.2-2006 Instruments that meet this standard?