To search: metal can defects pdf 
 In the future, I may search for: types of Double Seam Defects 
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Canada   1989  Metal Can Defects  (PDF)  Many pictures  
Canada  Metal can defects: identification and classification   
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AFDO 2011
A Guide to Can Defects and Basic Components of Double Seam Containers (PDF)
AFDO Packaged and Canned Food Defects Guidelines
What a pity. The information of AFDO is copyrighted. 
https://www.afdo.org/terms/ 
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USDA  Module 16. Closures for Metal Containers 
Page 60 -  
 
Can Defects
Examples of damage to metal cans and when damage requires return of merchandise.
https://media.alexandriava.gov/docs-archives/health/info/foodhandling/can-defect-slides.pdf
 Visual Inspection of Can Seams in Home Food Preservation  
FDA  Bacteriological Analytical Manual
Chapter 22A: Examination of Metal Containers for Integrity
January 2001 Edition 
FAO
GUIDELINES PROCEDURES FOR THE VISUAL INSPECTION OF LOTS OF CANNED FOODS FOR UNACCEPTABLE1 DEFECTS
A Guide to Evaluating Dented Cans    
Frain White Paper Double seamed cans
Glass container defects Causes & remedies
(It is glass, not a metal can)
How to Spot Visible Can Defects
Can Defects: Causes, Effects, and Prevention
Critical defects: These defects are serious you can’t just ignore them!
FRACTURES, HOLES, and MISSING SEALS
Major Defects: Pay attention to these defects too!
DISTORTED, CORRODED and DENTED 
Minor Defects: Most of these defects are the aesthetic problems in cans
BENDED, RUSTY and MINOR BUCKLES
 
