You should be able to get the INK , & Pens, from a Art Supplies Store .
The Platinum Tip Nibs are for the plastic drawing film / paper . Theyre Twice the price .The Std Ones wear quickly to a chisel point on plastic paper .
Ya gotta Talc the plastic .
DONT leave the pens IN THE SUN , they heat & expand the ink . glob splurt blot etc . Keep em in the SHADE .Somewhere Cool. Using them .
Std Pro Tip is dismantle & rinse Nibs in distilled water each week .
Dropping pens destroys the .35 & under nibs, or perforates bare feet & destroys the finer nibs .
Staedler do pens , fairly common .
Definately the tape to space the rule up , and draw in AWAY from the pen line , hold your breath , and count to three , or ten in a cold winter ,
before breathing , or the ink will move .
LIGHT Coat of clear first , not wet to disolve / displace the ink lines .
Some off the felts fade & the white is said to be worse at that .
Maybe art supplies'd have ink in vivid tecnocolour . A humidifyer was a big shot trick . Damp foam pad under pens is cheaper . Proba ly neccesary if using dope for ink .
Thats a Rotring Humidifyer . I had a round blue & grey Staedler ? one , bit of foam in the bottom you were supposed to dampen . Knock it off the bench swinging round .
Pen Set .
Nuther Humidifyer . Id put lead on the bottom , or double sided tape , in hindsight .
The plastic thing on the rights plastic lid, to keep on . Probly ceramic 100 year old one would be vastly superior .
Or make one out of an old piston ( Wright Cyclone or soomesuch ) and do a crack the glass jar that fits , for a top . A alloy disc drilled for pens , and a seal , youd beat it, hands down .