Characters may take exposure experience in French until they get to the Ability score of 4. If they take exposure experience in a season for another Art or Ability they may not take the French exposure experience. This exposure experience is different in that it has a source Quality of 4, not 2.
This makes it consistent with the Practice Source Quality for languages when you're immersed in the language. Practice experience is normally 4, but in cases where one is immersed in a language it becomes 8. A similar doubling of exposure seems warranted.