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Does anyone know why my blades go red when I normalize them


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My blades get this reddish scale when I am normalizing them. The harden perfectly but I'm curious to know why and if I'm normalizing wrong and for this reason they develop the red. 

 

Thanks! 

20200320_132245.jpg

20200320_132252.jpg

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Don't know the science behind it, but I believe it's a result of the H2O that is a bi-product of burning propane.  I get it in a lot in my cooler burning forge and only a little in my hottest.  Weather and humidity seems to be part of it.

Edited by Gerald Boggs
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