The makeup of alternate casein is similar to the cats.
In over a decade, I have not had a report of cats having any difficulties, so I do not expect any problems with the alt. casein.
Real casein is a natural product, like wood, antler, horn, etc. All of which can crack under the right (or wrong) circumstances. The trick will be learning how to control that tendency, in the real thing. OR using the "plastic" substitute--Alternate casein.
A wonderful, classy looking pen.
Do you paint the tubes when using casein or alt. casein?
Might as well ask the question here. I have turned quite a few pens from Alt Casein and i really like the way it looks. Most pieces are more symetrical than real casein and dress up just about any pen kit. Since it is a manmade material is there anyway the manufacturer or Ed if he makes them can make an Alt Casein rod, but make it black with gray or red with pink, etc. or whatever the colors would come out to be. I think that would be really sharp looking.