http://e26whn2524322mkxb3cbyk27ev2ihhq2biz35hty7gzgsyrwrygq27yd.onion/posts/blog/house-stuff/making-a-tree-trunk-shelf.html
So, instead I rubbed in some carnuba based polishing wax (it's actually intended for concrete - I bought it for finishing my poured concrete table ). With just a little bit of buffing it brought the grain into sharp definition, but without overly masking the light purple traces running through parts of the wood.