Changing thick lines to thin

[Steve Austin]

Thank you for that direction.

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Thank you so much--
but now is there a way to darken those lines a little?
I've tried threshold and contours.  
I don't want to go too light--

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Thanks a million Sally Anne.
I think I'm going with your first recommendation--
magic wand and deleting the black.
It seems to look the best on what I am printing.