Ground glass question.

I was out of town, and went to a yard sale where they had several pieces of photography equipment for sale. I found a stack of twelve at 3"x4" pieces of ground glass, which I purchased. After getting home, and started cleaning these pieces, I realized that they were frosted on both sides. I was hoping to use them to focus a few lenses I had removed from cameras for repairs. Now I am not so sure. They're not heavily frosted, as in you can see through them, just everything is blurry.
When you collimate a lens to a camera, wouldn't you want only one side of the glass frosted? I figured you would want one clear side to look through to make sure the image is sharp. Maybe I am just over thinking this...
Eric

You're right, only one side of a ground glass is frosted, and the frosting should be exactly where the film will be.

Maybe there diffusers out of an enlarger or something.
Ground glass for a camera needs just one face to be ground , which is where the image is projected to tie in with the film plane .
Having two faces ground will lead to confusion and error .
I'd find another use for them .

Thank you gentlemen for your responses. I will find another use/home for them.

Eric

A good and relatively easy use for them would be a shelf for small objects. My bathroom's mirror cabinet uses frosted glass for the shelving.

Put in the filter drawer of a condenser enlarger; turn it into a diffusion enlarger.

Or the front surface of a calibrated light source.