Casein – milk based plastic

Ebonite – Doesn’t like sun, doesn’t like water, but it’s still my favorite.

From Sid Saperstein the Wahl Nut

Forum Discussion about general care

 

CELLULOID – Beautiful, but sometimes fragile.

Storage tips from Ron Zorn

Journal for the American Institute for Conservation

 

CASEIN – Here is some fun reading on an interesting material.

An article from Pen Trace.

From David Nishimura.

Vintage Pens – David Nishimura.

On Fountain Pen Network.

Don’t soak it.

WES Pen Club.

Good Writers Pens

 

GENERAL – Ravens March Covers all the materials.