Cheap ND 10 filter ?

Hi everyone my brother sent me down some welders glass which apparently makes for a cheap (free) filter whats the word on the epz street on this and whats the best way to use it cos i just love dry ice lol mmm can i reverse the lens hood and stick the glass to it with something like blue tak ? any dour Scots oot there tried this or indeed any of my British friends eg tight Yorkshiremen lol 

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I'm neither!
I used one on a lens with a scalloped hood. I turned the hood round and used 2 rubber bands which hooked round the petals. As long as its in contact with the rim of the lens, no stray light can get in the side and cause flare.
Make a little cover for the eyepiece if you don't have a built in one, as the extra light can cause exposure errors.
It can be quite hard to get rid of the colour cast completely, but I have used one ok. Shoot RAW and you will have more adjustment at the processing stage, or use it as black and white.
You might be able to get a colour filter to counteract the colourcast. My filter was a strong green/yellow.
Experimentation is the key!
I used one on a lens with a scalloped hood. I turned the hood round and used 2 rubber bands which hooked round the petals. As long as its in contact with the rim of the lens, no stray light can get in the side and cause flare.
Make a little cover for the eyepiece if you don't have a built in one, as the extra light can cause exposure errors.
It can be quite hard to get rid of the colour cast completely, but I have used one ok. Shoot RAW and you will have more adjustment at the processing stage, or use it as black and white.
You might be able to get a colour filter to counteract the colourcast. My filter was a strong green/yellow.
Experimentation is the key!