This is an option on an envelope. See the screenshot.
I’ve clicked for more details but it still isn’t clear what this is about… Thanks
My guess would be a plain envelope on the inside for no tint. You know how the insides of some envelopes have color or pattern on the inside so someone can’t read your mail through the envelope is my guess for if you added tint and checked the box.
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yeah - it’s the gray crosshatch pattern put on the inside of envelopes so that you cannot hold them up to the light and see/read the contents.
Useful in particular if you are sending a little check with your card!
Thanks everyone. I have never seen this before and had no idea this even happened.
If I send a cheque in the post I always put it inside a piece of paper and assumed everyone else did the same. Learning something new every day 
Ha ha - I did that but didn’t notice any difference 
but now I know what I’m looking for I can easily see it. Thanks for posting the image.