Click on the images to enlarge and see the patterns in more detail. The numbers after the name is the obscurity of the glass. As in all frosted glass, you can see shadows behind it so the obscurity is very important. 5 is the strongest and 1 is the lightest obscurity. It is not uncommon for customers to ask for both the panes (in double glazing) to be frosted to strengthen the obscurity as opposed to 1 pane being frosted and the other clear.
Charcoal Sticks 4