I would like to share my experience with spalted wood that is made by wood-decay fungi creating additional texture and colours in wood that does not lose its quality. More on: https://en.wikipedia.org/wiki/Wood-decay_fungus.
I have been testing several types of wood e.g. beech and larch whose trunks have been lying on the ground for 8 years; wild cherry that has been lying on beams for 6 years and finally birch tree that was uprooted 4 years ago.
This maple wood comes from our farm in Walachia in Moravia, the Czech Republic. Its tree was cut down 3 years ago and it has been lying outside for 3years but in the air. In my opinion the wood is not so much affected by fungi and it can be left exposed to them more as you can see in the photos.
The dimensions of these two pieces are: the hollow form 39 cm x 9 cm and the bowl 30 cm x 17 cm.
I am going to turn the other woods mentioned above and will share my experience.