I'm posting these images so that they will stay on the site after the book is gone. Might answer the question of repainted U.S. WW2 grenades. From a 1948 manual which is an 1944 book reprinted. I suspect all the images are from the 1944 book.
Interesting that it shows them painting a black stripe on the lever to indicate a renovated/modified grenade. If I am not mistaken most people think that the black on the lever indicates a resused lever...... Hmmmmmmm
likely a lot of Yellow grenades were repainted green by these units, so maybe a yellow grenade over painted green with a black stripe on the lever is correct if that has been noted ?
could striped on one side and dipped mean the same thing only the method of applying the black is different, perhaps a more industrial setting would dip hundreds, the field set up might allow for the stencil approach on one side as the lever is on the grenade. Black on the underside is not seen readily and is wasted paint, but unavoidable if the lever is dipped unattached. The book is dealing with a Platoon level unit in the field where everything is done with light equipment.