NO NO NO. Regular medical bandage tape falls off whatever it is stuck to when it gets moist.
food safe cake tape - Page 2
A propos of nothing in particular, I noticed the other day while I was in Home Depot that they have two grades of PVC - one for incoming water and one for sewage disposal. I don't suppose that copper is the same, is it? I'm a big Press 'N' Seal fan myself.
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That's right and for cakes you MUST use the "supply water" grade. The waste water grade of PVC is known to be able to release cancer-causing chemicals into plain tap water.
I would never use copper because of the stuff like buttermilk, yogurt, acid calcium phosphate in baking powder, and other ingredients that contribute to a cake's ability to corrode. Copper also reacts to alkaline materials like baking soda.
And galvanized pipe is right out of the question, because zinc reacts faster than copper.
Are cakes boring without such hardware? yeah maybe, but also not nearly so likely to cause some horrible disease.