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I would suggest using of the threads taken from tights of black or graphite colour. These are easy attached with polistryrene or CA glues . Also can be stretched giving a nice effect of thin cables without any painting.
What, he's stolen (or borrowed!) Jan's tights ?!!!
It also saves 'getting it in the neck' when Mrs. Geo discovers you've ruined her best tights by pinching a thread from them !!!