cbaldwinI don't have the Pelikan White Tortoise (I ordered one on this drop), but I have had a Pelikan M205 Tradition in white for over 3 years and have never noticed any issues with yellowing or discoloration . I use reddish brown inks in it (Pelikan Brown and Montblanc Toffee Brown) and haven't had issues with staining either. I hope this helps.