Hello to all, as with everything that concerns Lugers.. replacing the enamal in the safety area, is not an operation that can be done correctly without a little learning curve and patiences / practice ...
... The enamal (testors plastic model paints) can be mixed correctly to obtain the exact shade of off white needed.. you just have to test a few combinations, and let them both dry & age a'bit.. To apply, you can just fill in the recess, and then wait a'bit, (hours, days???) then mop up the residue, using thinner or acetone dampened cloth...
... not too much wiping, as it'll all disappear... now... you really have to wait a'bit, (might accelerate with heat) for the enamal to cure... I'm talking months!!!!
.. Then try to wipe it out of the recess with anything... almost bulletproof!! ....
.....I believe the originals were filled with white and red lead, art based filler for these types of applications... But I certainly could be wrong, as I can't really back it up with any printed resources.. best to all, til...lat'r....GT