http://www.film-and-darkroom-user.or...hp/t-5118.html
See the last post.
Ryuji gives Kodalk as 8-mol.This is CAS 1055 76 7
The 4-mol is CAS 16800 11 6
If Kodalk(or other suppliers 8-mol) is used this apparently necessitates a correction for the difference in molecular weight.
Good spot Relayer.