The color is silver rather than gunmetal rather than black. It was good that bolts of strength class 12.9 were able to discover this because black dyed goods are many and inferior in corrosion protection. I'd like sizes of 8 × 40 and 10 × 25, but it is somewhat disappointing because it is not in the lineup.
I have been looking for SCM bolts that do not generate rust and can be fastened with high tension for many years of use. Do not rust so-called black dye bolts.