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Home / R&R Academy / Defect Analysis / Positive Metal Defects / Burn-In
Burn-In
![burn-in.jpg](https://static.wixstatic.com/media/cc5f22_32ce12490ce64c80bb47c2c1f23006d1~mv2.jpg/v1/fill/w_296,h_296,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/burn-in.jpg)
Burn-in presents as a grainy surface, often with black stains. This defect indicates that the mold and metal were overheated, causing a metal mold reaction resulting in oxides and silicates covering the mold.
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The causes of this defect are evident in the shell and metal portions of the process. To cure these causes, R&R recommends taking the following actions.
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