An old Celtic tradition, which is a a deeply moving tradition of binding of two people, it's where we get the phrase, "Tying the Knot".
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You can choose to use as many colours as you like based on their symbolism.
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White - purity, concentration, meditation, peace
Black - strength, wisdom, vision, success
Brown - earth, grounding, talent, telepathy, home
Green - finances, fertility, charity, prosperity, health
Yellow - charm, confidence, joy, balance
​Red - passion, strength, lust, fertility