Geo wrote:

Replacing a 38 year old glass pane in back door (I broke it removing
old putty).
The new glass is toughened and patterned on one side only.
Is there any convention/advantage for which way round it goes? Smooth side
in or out?
I can't detect any difference in the obscurity either way.
I am inclined to put the smooth side out - since the reason for
removing the
old pane (patterned both sides) was water penetration at the bottom.

That would be the way to do it if you ever intend to clean it.

--
AnneJ