For those of you that use Scottrades Streaming Quotes here is useful information on what the colors mean for each trade.
Trade data is color coded so that it is easier to see the momentum of the trades.
Green = trade occurred on the Ask,
Red = trade occurred on the Bid,
Cyan = trade didn’t occur on the Bid or Ask,
Yellow (Yellow) = trade broke either the High or Low for the day.
This is from the Scottrade help center online
