I have an issue of change in Casting color of Steel Grit Shot Blasted component. I have tried in different semi synthetic coolants
Tried in a different concentrations between 3 - 7 %, in all the ratios color change occurs.


--- The color change occurs in the non machined casting area.
--- The color is geeting changed from a Silver color to Dark Grey color.


We have tried increasing the water hardness of the coolant to certain PPM, at this stage color change is not happening.



However its difficult for us frequently increase the hardness of the water all the time.
We are looking for a complete solution. Please help in this regard.

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