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Any way to remove fungal spots?

I don't know if oxalic acid would work. It's good for some types of stains. If you used two-part wood bleach it would work, but it also would bleach the entire bowl to a very light color.
I would suggest testing 2 part bleach before committing. On the bottom foot
I might just make the spots pop. Or it might lighten them. I’ve not been good at predicting effects on untried woods and their respective stains.

Two part wood bleach has different effects on different wood existing stains
Makes red box elder beetle stains more vivid.
Turns the rich browns from ambrosia Beatles a sort of ghostly green - I don’t like the change- others do.
Spalt lines are not affected.
It doesn’t take the blue stain out of holly

Two part bleach is a great tool I enjoy using
 
It is a matter of personal taste. For me, I would leave them. I did a table once for a client, and one of the side stretchers, figured maple, had a beautiful dark mineral stain feature, kind of oval shaped. If I was making the piece for myself, I would have put it on the outside as a feature. Knowing her, I put it on the inside because she wouldn't have liked it.

robo hippy
 
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