ASTM F1554 requires the end that projects from the concrete to be marked with a grade identification marking, which, unless otherwise specified, is blue, yellow, or red spray paint on the projecting end only. If a supplemental requirement is specified then the projecting end will be stamped with a grade stamp and/or a manufactures’ identification stamp.  The embedded end does not need to be marked in any way.  Since a headed anchor bolt functions with the forged head being embedded into concrete the head thus has no marking requirement and instead the threaded end receives spray paint or a stamp.