Clairol ProfessionalPermanent Liquicolor for Dark Hair Color, 5aa Light Ultra Cool Brown, 2 oz.

Colored my hair 30 mins ago with l'oreal "cool light brown" 6c and it didn't cover 40% of the gray. will this work better and which is "cool brown"?

which Clairol product is considered semi perm not permanent

Would this be considered a box dye? My stylist does not want me to use box dye.

What's the difference between light neutral brown & light neutral rich brown?