Pieces of dough can shrink by up to 30% when being baked in an oven. This has a big effect on product shape and dimensions when designing new products. They also change the way they fit into packets !
That the chocolate we know and love starts off by growing crystals inside it! Chocolate is tempered before we mould it into a bar shape. Tempering basically means we heat and cool the chocolate to encourage the fat to crystallise. These crystals grow over the next few weeks and affect the taste, hardness, and glossiness of the chocolate.
If you ask nicely, I’m sure your chemistry teacher would be able to explain it a bit more. Or feel free to ask me more about it in another post.
PS. Tempering is what chocolate and glass have in common!
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