Originally Posted by
dneal
If Karl's pen were black celluloid or hard rubber, I would use latex with any ink and just change it when it needed it. In fact, I do precisely that with a Sheaffer OS balance. I changed the sac earlier than it probably should have needed it, after only a few years, since it seemed to stick to itself and generally be less resilient, so there might be something going on there. I just don't happen to mind or care. However, I would choose silicone on Karl's actual pen for no other reason than to prevent further darkening of the barrel due to latex out gassing.
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