The Mad Scientist of Levi’s

SAN FRANCISCO — If you are here to see the man in charge of Levi’s Eureka Innovation Lab, a test kitchen of denim in a former mill 10 minutes from the company’s Embarcadero-area headquarters here, look for what appears to be a blue manicure. Bart Sights, 51, takes his Levi’s 29 inches by 34 inches…