Spalted Maple

[inspectorwoody]

dad2nine

First picture of your post appears to be IMO, quite a bit of stain.  The other two show some mineral but it appears you have hit the heartwood.

 

The lumber above was one board but due to planer limit, you can see I split it. I'm not sure how long this board has been air drying but it has been quite a few years. I found it leaning againest the wall with some other lumber while tearing out the sawmill. Moisture content was 7%.

[SwampDonkey]

Spalted yellow birch looks exactly the same. My brother used some of mine and had a gun case built. It was not real dry at the time, and the doors did warp some. The rest of the cabinet was stable.

[Max sawdust]

Inspectorwoody,
Those pics are some nice classic pictures of spalt.  It is my understanding that the black "ink" lines are what turners like.
I am milling up a dead standing Soft Maple, that has heavy spalt in the skirt wood ;D, unfortunately it also is quite wormy >:( 
max

[Ron Wenrich]

Spalted Ambrosia maple.  Seems like that would work, too.   ;)

[Tom Sawyer]

Spalted Ambrosia maple.  Seems like that would work, too.   ;)

I have about 600bft of spalted ambrosia maple right now for sale if anybody wants to come and pick it up.   Oops, wrong board :