In article , Bob Daun
wrote:

Do not really want to prolong this thread too far but I have
another question to throw out. What about turning immature black walnut.
It has a lot of grain but not the typical walnut color. Is there a way to
treat a bowl turned with immature walnut to convert it to the typical Brown
color. I tried ammonia but it didn't seem to have any effect.

I remember reading that this is done commercially to stretch out the
amount of marketable Black Walnut.

Someone will doubtless jump in here with the relevant details, but if I
recall correctly, it involved heating in water [?] to dissolve some of
the colored substances from the heart and deposit same on the lighter
sapwood...

It's probably more complicated than that :-)

-j