Tom from SWISCO responded:
May 2, 2017
I think your tip was once red, but lost its color over time. They don't make a brown tip so red is the only color that could fade to what you have. Green tip could also work, but you run the risk of it being too strong. Then again, there's also the risk that red would be too weak. Knowing the weight of your sash is the only way to be 100% sure.
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