Hi. So I wanted to make some custom ruins for my fish bowl/tank It would be for freshwater fish. Ive read around about it being okay with low levels of ph in the water, but i wonder if the type of sandstone from shapeways would be okay for fish? I like the fact that sandstone is full color for textures, and that it would sink.
In FCS, the gypsum is held together with a super-glue type substance. That might not be good for certain hyper-sensitive fish. I would think that it might be okay if you allow the model to "season" for a while in water of an equivalent PH without actually being around any fish.
The ink for FCS items is water-soluble, so it will soon be "not Full Color" - and I don't know what the fish will say about it. You could cover it in varnish - not a water-based varnish, of course. In one of the other threads there was a discussion of food-safe varnishes. Greetings Dragoman
What Dragoman said. Sandstone is not water safe. Ceramics is only water safe on glazed areas, so if your submerging it, the unglazed base would be an issue.