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Home / R&R Academy / Defect Analysis / Other Defects / Black Stain
Black Stain
![black-stain.jpg](https://static.wixstatic.com/media/cc5f22_ed18114d5e364ff18ffda5deabb0dad5~mv2.jpg/v1/fill/w_296,h_296,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/black-stain.jpg)
Black stain presents as very superficial black spots on a good and smooth casting. This defect indicates that the metal reacted with oxygen forming Chromium (Cr) and Manganese (Mn) oxides during melting, casting and solidification.
Technical Support
Struggling with a specific casting defect or just need general technical support?
Email our technical team at: Technical@ransom-randolph.com.
The causes of this defect are evident in the metal and other portions of the process. To cure these causes, R&R recommends taking the following actions.
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