They can be stored in a cool, dry place for a while. If they are not going to be eaten for a few hours after initial baking, then they can be stores in a refirgerator.
I'd never heard of it before, but a quick internet search returns the following information: It is produced by Nestle, apparently in South Africa. If you're looking to purchase this bar, running a search for Nestle Tex Bar will get you some online stores where it can be purchased.
Depending upon the source, there could be 300, 800 or more chemical compounds in chocolate. These include caffeine, phenyethylalamine, theobromine (toxic to dogs & cats), and flavanoids. Chocolate is very complex - apparently even more so than wine. Also, understand that everything is made up of chemicals. Even water, written as H2O, is a chemical compound.
chocolate from Switzerland
Sweet icing made from buttercream (butter and cream).
One common recipe for buttercream includes RAW whipped egg whites, simple syrup (sugar and water), and butter. Flavorings can also be added, such as melted chocolate, to make chocolate buttercream.