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
You-Are-Loved Chalk Message Project in hundreds of locations across country. In 2012, the Chalk Message Project became part of Active Minds' National Day Without Stigma programming. You-Are-Loved Chalk Message Project The You-Are-Loved Chalk Message Project was an annual US-wide initiative that combated hateful rhetoric aimed at the lesbian, gay, bisexual, transgender, and queer (LGBTQ) community through the use of positive, uplifting chalk messages. The project's mission was to send messages of hope to members of the LGBTQ community who were struggling with depression or feelings of isolation. It served as a suicide prevention awareness campaign for LGBTQ college students. The You-Are-Loved Chalk Message Project