From time to time we hear from customers that they have "scratched" their silver membranes. This occasionally leads them to ask: Is there some sort of coating on the membrane that is being rubbed off?
Answer: Our silver membranes are made of 99.97% pure silver and do not have any coating on them. What may appear to be scratching is actually a polishing of the silver surface, which makes the silver reflective. This can be done when the membrane is rubbed with a metal object, such as tweezers. We also posted a brief video demonstrating the effect. You can watch it here.
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