In a message dated 4/1/00 9:02:37 AM Mountain Standard Time, apistowise@bewellnet.com writes: > I'm confused by your answer. Think about what is happening to ancient marble > monuments around the world right now. They are disintegrating from > pollutants & > acid rains in the air. Marble is metamorphosed limestone - CaCO3. > Metamorphosed > limestone (marble) is denser and less porous, with larger mineral grains, > than > sedimentary limestone. But it reacts to chemicals in the same way limestone > does, only a bit slower. Would you put put limestone in a tank with soft > acid > water??. Perhaps you could put an inert coating over it for protection, but > most > marbles have veins, too. I would think these would be structural weaknesses. > I > wouldn't use marble as a backing without some other material (glass) as a > support. Maybe I'm confused here. I thought marble was metamorphosed granite. If it is limestone, then it will need a couple layers of clear epoxy over it. Can I just retract my statements? Please?? Bob ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!