RJS, we'll have to wait for the chemical analysis -- but, yes, icing sugar not likely.
Perhaps I should start posting the "color by Horticolor" warnings again...
color by Horticolor: lets throw a few pictures together and see what happens...
My images are not intended - and have never been intended - to be authoritative. They are an idle amusement -- a trifling -- a mere nothing.
If you take the Opportunity see them in that Spirit, then you will be reborn like the Phoenix from the ashes of your nest of cinnamon twigs. ( or your funeral money cheerfully refunded. )