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Home / R&R Academy / Defect Analysis / Negative Metal Defects / Rat Tailing or Oxidation Crazing
Rat Tailing or Oxidation Crazing
![rat-tailing-oxidation-crazing.jpg](https://static.wixstatic.com/media/cc5f22_584308cce70c4c908fb05dab676152c3~mv2.jpg/v1/fill/w_296,h_296,al_c,q_80,usm_0.66_1.00_0.01,enc_avif,quality_auto/rat-tailing-oxidation-crazing.jpg)
Rat tailing or oxidation crazing presents as river-like depressions, mostly linear grooves, in the casting. This defect indicates that the primary coats cracked slightly, giving access to oxygen. The reaction between oxygen and the metal follows a crack in the shell.
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The causes of this defect are evident in the shell and other portions of the process. To cure these causes, R&R recommends taking the following actions.
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