In combination with annatto (E160b), turmeric has been used to color cheeses, yogurt, dry mixes, salad dressings, winter butter, and margarine. Turmeric also is used to give a yellow color to some prepared mustards, canned chicken broths, and other foods (often as a much cheaper replacement for saffron).
Confidence votes 211K. It is 54 miles according to Google Maps. Given is the calculated distance as well as the driving travel time, which does not take into account driving conditions, traffic, etc. The distance between Dayton, Ohio and Cincinnati, Ohio is 50.4 miles. The resulting travel time is 52 minutes.
While not on I-70, South Charleston (another small town, but smaller than London) may be another option. Of course, you may not end up with a job in Columbus. If that is the case, I would focus looking between Dayton and Cincinnati. There are more connections between these two cities, mainly in roads and commuters. People do commute from the Dayton metro to Columbus, but they are fewer than the ones who go south.