TWS uses colored text, numbers (or tick dots) and backgrounds to convey additional information, at a glance.
For options contracts, colors relay the following:
- The “Model” price uses colors along a gradient graphically depicting its relationship to the bid and ask, where yellow is equal to the bid and blue is equal to the ask. See the detailed spectrum in the TWS Users’ Guide.
- If a price is displayed in PURPLE, this indicates that the best price is not executing automatically at one or more of the exchanges displayed.
- Implied volatility is always displayed in either pink or white. If either the Model or Imp Vol(%) value is white, it means the model hasn't calculated any prices or implied volatilities.
For general information about the use of colored values in TWS, see the user guide topic.