### Clue: French chalk adding quality to Palmolive and Lux? (9)
### Answer: SOAPSTONE 
 ### Explanation: Definition: French chalk
 TONE(in general, the quality of something; specifically, the characteristic quality of the sound of a musical instrument) **placed after**(adding … to) SOAPS(of which Palmolive and Lux are brand names).
Defn: The mineral, the soft variety of which is used to make French chalk, used by tailors for marking fabrics.