The stuff has been aluminium for a century, but that doesn't make any difference to its RF blocking abilities - Al is actually rather better. The trick is to w

The stuff has been aluminium for a century, but that doesn't make any difference to its RF blocking abilities - Al is actually rather better. The trick is to wrap it so that there are no gaps, phone signals will get out of tiny gaps. ... of course before even tin "tinfoil" things were tough. Mother would be stood over her anvil in the kitchen battering the wrought iron over the tops of left-overs