Like notaries, witnesses aren't generally required in order for a contract to be legally enforceable. However, each state may require special kinds of contracts (e.g., real estate deals, wills, and marriage agreements) to be witnessed by a third party in order to be binding.
McDonald's, apparently, use red and yellow because red=fast and yellow=hunger (hence fast food!). Remember also that meaning is what we create. It does not exist in the color itself and individual meanings may or may not exist in different cultures and individuals.
GREEN ANGLICAN PRAYER BEADS. Green, the color of new growth, represents life. It is the most commonly used liturgical color and is used during 'ordinary' time or the season following Pentecost. Green symbolizes our personal growth as we daily study the scripture, expand our knowledge and grow in faith.