Blackboard ‘chalk’ are produced especially for use with blackboards in white and also in various colours. White chalk sticks are made mainly from calcium carbonate derived from mineral chalk rock or limestone, while colored or pastel chalks are made from calcium sulfate in its dihydrate form, CaSO·2HO, derived from gypsum. Chalk sticks containing calcium carbonate typically contain 40–60% of CaCO (calcite). As compared to whiteboards, blackboards still have a variety of advantages: On the other hand, chalk produces dust, the amount depending on the quality of chalk used. Some people find this uncomfortable or may be allergic to it, and according
What Separates Me from You Way", "Sticks & Bricks", and "It's Complicated". "What Separates Me from You" received generally favorable reviews. James Christopher Monger of Allmusic said, "[It] is whiney, petulant, immature, hopeless, and thoroughly addicting, as the ten songs contained within the gatefold packaging [...] are as immaculately crafted and engaging as they are blindingly self-absorbed." Brendan Manley from Alternative Press wrote, "The vitriolic delivery seems sincere, but even if you don’t buy into all of the personal/emotional factors underpinning "Separates" (smack-talking the smack-talkers/a recent, devastating breakup/assorted perils of touring), the album simply "kills"." However, Christine Caruana of Loud Online said, "[It] is very