Missed 1B - double 1B appeal?

[WestMichiganBlue]

Batted ball to F6, B-R dives in to 1B, touching the white bag with his hand, beating the throw.

While still laying on the ground and touching the base, the B-R is tagged by F3 who appeals for a missed base. B-R still has not touched the colored bag, but - OTOH - the appeal has to be made before the B-R returns to the bag.

So is he out - touching the white base is no different than being off the base returning from RF?

Or safe because it is too late to appeal?

WMB