No, see post #74, it is thought Kodalk is the 8-mol.

8-mol is NaBO2.4H20 which used to be written Na2B2O4.8H2O and called sodium metaborate octahydrate.This agrees with The Darkroom Cookbook p177 which gives the composition of Kodalk as sodium metaborate octahydrate, ie they use the old name.

If you have Kodalk the weight of metaborate given by Mark has to be multiplied by 1.354. as he uses the 4-mol compound.