Does anyone have any experience using reddish or burgundy colored inks in a modern MB with an ink window, such as a 146 ? I like PR's Burgundy Mist and Noodler's Ottoman Rose, but am apprehensive about using it for fear of staining the wink indow of my MB146 or Pelikans for that matter.

Thanks for your help !

Hello!
I don't have PR Burgundy Mist or an MB piston-filler, but I can tell you that PR Plum ink did permanently stain the clear barrel of my Omas Extra pen....

While I wouldn't compare a Wality 77 I have to the MB, I noticed that Burgundy Mist stained a plastic sleeve that the nib and feed fit into.

BTW, the stain is fuschia, not burgundy!