When did the color white for wedding cakes become a tradition?

Didn't need freezers, the alcohol used to soak the fruit in the cake would preserve it.

Bubu, If you had an icehouse you didn’t need white sugar to flaunt your wealth . Most retained cake layers were heavily wrapped in grease proof paper and stored in an airtight tin .

Player #Meg, true, but there were ice houses.

freezers weren't available in Victorian age.