I used to make fan cels but stopped about a year 
ago. Now I am trying to start up again, but I 
can't seem to find a type of ink that will dry on 
acetate. I have used Micron and Staedtler pens, 
both of which have permanent ink, but neither 
seems to hold on to the acetate (it wipes right 
off). Can anyone tell me what is the proper type 
of ink to use? I don't remember which type I have 
used in the past...  Thanks for your help!