It has been a while since I reported on progress in my effort to use up/wear out everything I have. No resale shop will take this now. My family put this through the dishwasher regularly for about 35 years. I first noticed the ink was washing off about 20 years ago. We found ways to continue to use it even after the red ink that marked volume was mostly a memory. We always had the ingredients for cocoa mixed. Making it was easy in this two-cup measure. I plan to put pencils in it on my desk.
converselyspeaking 
Have a picture of it? I have such a measuring cup too. Maybe we could etch the lines back on with acid or something.
Me, I’d worry that etching the glass would weaken it–it might pop in the microwave or when I pour in boiling water to make cocoa. What about a steady hand, fine brush, and automotive paint? Would a decal or tape stick? Congrats on wearing yours out–I wonder how common it is.