The pics were taken with a special "macro" lens on my DSLR. Here is the lens: http://amzn.to/29KFZH8

You can usually see pressure signs with the naked eye. The images were high resolution so that the effects could be easily seen by anyone reading. Any magnification will help however. The illuminated loupe I mention in the article will work quite well. Here it is: http://amzn.to/29KGAs4