[Greenbuilding] mold on timbers

[Ken Beiser]

I am doing a project for a client has some wooded acreage and he did a little logging to prepare his building site.  The logs sat on the ground and in a pile for almost a year.  He had them milled into some 8 by 8 timbers and they were obviously pretty wet when they arrived at my shop.  Shortly after they were here, mold started to grow on ONLY the corners of the timbers that still contained sapwood.    I realize that WAS the live part of the tree but it has been dead for a year.  I also realize that the most moisture and possibly food for the mold could have been in the sapwood.

I was hoping to get some information on how to kill the mold and remove the discoloration in the process.  Bleach did not discolor the wood much but the mold looks like it is still there but I suppose it is dead.   How can I tell if it is dead?  Any input would be appreciated.

Ken 
Western Woodwrights
Whitefish, Montana