Thread: Blue Marking Lines
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Old 03-07-2015, 07:28 AM
  #7  
Gramie bj
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Location: Riverside Washington
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I have a new blue marking pin, have not tried it yet. The instructions say remove with water before you wash, because some laundry detergents have something in them that will or can set the blue color. Wonder if blue chalk could react the same?
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