For anyone interested, I ran a test of White Pearl and Bianco Superiore quartzites using hot sauce, mustard, ketchup, berry jam and salad dressing. After 24 hours, the Bianco Superiore wiped completely clean. The White Pearl has a significant stain from the hot sauce and minor discoloration from the mustard. Neither etched.
I'm actually really impressed with the durability of the Bianco Superiore.
Q