Not that old chestnut

[devon TWiG]

Because you have sanded and applied a finish to the bowl, this protects it from oxidisation and UV light ( unlike the shavings ) in the long term the bowl will become dull brown , nearly all wood does ( on the surface ) look at a Yew antique !. The same happens with most cut wood in both dry and green form , although fresh cut , wet /damp wood can also be discoloured by fungal activity, this is noticeable on fresh pruning wounds or felled stumps . Dry seasoned wood is dull on the surface but plane or sand it and see the difference !!

[Dan Earp]

As above.

Some beautiful olive ash from big J,

Dark etc on the outside and when i had it halved in thickness an amazing light coloured wood with great grain