1. Wash beans and cut into 1" pieces.
2. Cover with boiling water and 3 tbsp. salt, and cook 1/2 hour.
3. Drain very well.
4. In another large saucepan, mix vinegar and sugar, and bring to a boil.
5. In a small bowl, mix flour, mustard and turmeric.
6. Add enough cold vinegar to mix to a smooth paste.
7. Add this to the vinegar and sugar mixture, stirring vigorously to keep smooth.
8. Add drained beans and celery seed.
9. Boil 5 minutes.
10. Bottle hot, and seal.