Its the UV not what you see.
Brian

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From the Sofa of Brian Gaff Reply address is active
"Gefreiter Krueger" wrote in message
news
For a small arc welder for a small job, is a mask really necessary? The
spark doesn't look any brighter than starting at a bright lightbulb.

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"Why do the birds fly south to Africa in the autumn?"
"Because it's too far for them to walk."