On Tue, 10 Feb 2004 18:55:50 -0500, "Dsorgnzd" > wrote:


>
>This may sound strange, but I have found that a razor blade scraper helps in
>removing the most difficult burned-on deposits from a porcelain surface.
>Porcelain is basically glass, which is harder than the steel of the blade,
>so you don't scratch the porcelain. It's roughly analagous to scraping paint
>off a window pane after painting.
>

I'm not going to state that you are not able to clean
your surface with a razor blade but most porcelain can
be at the most as hard as glass or steel (your razor blade),
but can also be softer. Most porcelains falls into
a Mohs scale of hardness between 4 and 5.5.

<http://www.porcelainenamel.com/pei502.htm>

Glass is near the upper end of porcelain at 5.5 and
steel can be 5.5 to 6.5 in hardness.

<http://waldaninternational.com/hardnessDef.shtml>

The porcelain and steel can vary according to
composition. So, not scratching your porcelain
does not mean not scratching someone else's
porcelain.

Also, if the porcelain has been roughened or
abraded by using abrasives before using the
razor blade, the ability to scrape the deposit
will be degraded.

Greg Muncill