According to results from a few people and estimations from processing the mylars, there is an average of 0.05 grams of silver per mylar.
I do know myself that the thickness of each brand of keyboard is thicker. I'm not sure of the level of thickness accurately, but some of the silver on some keyboards is flush, where you can hardly feel the silver when rubbing your fingers across the mylars, and some are so think that you can feel the thickness against the plastic when rubbing.
I'm working on either scanning the mylars or taking pictures of them with a scale for references because there is a lot of information to be gathered in mylars. I have scanned some before and even though you can see the lines running through from the other side, it's not really a problem. Besides, it'll be a good thing for me to do because some mylars that have silver showing through them from the top side, but when you turn them over, they're covered with carbon and sometimes another material that varies in color, which will hinder the recovery of the silver. The non-transparent mylars would be easier because you only see the lines on the one side and you'll have to turn it over to see the lines on the other side.
Hopefully this week, I'll be working on a database of mylars, regardless of how many brands or styles out there. It can be done very fast, especially if people upload an image of the keyboard and the mylars that's in them. With that information, at least people would be aware of what they have and they'll also know which ones contain the most silver. Also, there are keyboards that do NOT have mylars in them at all. That's some information people should know, because I bought a gaylord of mylars last year and I ran across a few keyboards that do not have mylars in them at all.
Also, some keyboards not only have mylars, but some of the keys contain gold contacts under them. I have a few of them that have gold plated contacts under the keys that springs back up when typing. Those are from some of the older keyboards, which I still have some left that I didn't take apart yet. I'll take pictures of them and add them to the database.
Kevin
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