The book has quite a few plot holes. For example, it's never explained why the main character came to town.
Things to place here are for example:
The grana cheese known as Parmesan is not now so well made at Parma as in some other parts of Italy - Lodi, for example.
You must create and edit them with an ASCII editor, for example notepad.
The carbonyl group by itself does not produce colour, but when two adjacent groups occur in the molecule, as for example in the a-diketones (such as di-acetyl and benzil), a yellow colour is produced.