Get the glycerin or odorless petroleum jelly (Vaseline). If you get the Vaseline, warm some in a double boiler and mix your castor. I can’t tell you the ratio since I’ve not done it in a very long time. I’d just say to keep adding the castor until you can smell it pretty well. I’ve made it in the past and it’s worked very well for me. I don’t recall if I had any problems with freezing.
I don’t imagine anyone has taken pictures of mixing castor with glycerin or Vaseline (it’s pretty easy) so you may be stuck with these instructions.
Hope this helps,
Bob
_________________________
Semper Fi,
Bob Anick
Sergeant Major (ret)
USMC