I have a really rookie question. I am rebuilding/restoring an older 1000. I have it all taken apart and am going threw the amazingly slow process of cleaning before i repaint and put back together. My question is...was the inside of the firebox originally black or was it bare? I have been scrapping and scrubbing to get what I thought was baked on grease off and was just curious if it was the original coating. I know not to paint the inside when done.