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Well now you know for sure you have a Hindostan, and a fine finisher as well! Great!

If you cant use the oven, you can put it in a pan and boiled it for like 15 minutes that really worked for me i had the pleasure to clean two hindostan and both started as black as night! Enjoy!

Still looks very dirty on the last pic but looking at the first pic it kinda looks like a hindostan stone if you clean the sides of it do you see any banding or layering?