Jim GM4DHJ ... wrote:
what do you call that stuff when you were making up your own
mastic...you used boiled linseed oil and a red kind of granular stuff
may just have been raw mastic or something...it is annoying the **** out
of me that I can't remember what it was called probably only liseed oil
masic...not used it for years...

https://scialert.net/fulltext/?doi=jas.2006.1009.1016

"The name putty is also applied to substances resembling putty,
such as red-lead putty, mixtures of red and white lead and linseed oil."

Somehow, that doesn't sound all that safe.

Paul