In the UK Tate & Lyle is cane sugar and Silver Spoon is beet sugar, but brands in other countries will vary and quite a lot of sugar will be a mixture of the two. Also the packaging may not identify the source. You do want to use a refined white sugar for marmalade and jams.

What sugar is best for making marmalade?

Granulated is the go-to sugar for marmalade making. Its larger crystals will dissolve quickly and cleanly, making a clear, amber liquid that best displays your perfectly suspended peel. White granulated and the unrefined golden granulated taste quite different to each other, and it's worth experimenting.

Can I use Demerara sugar in marmalade making?

If you would like to have a marmalade with a deeper flavour, you can substitute some of the sugar in recipe for brown, Demerara or mollases sugars.