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Thank you all. I should perhaps have made it clear that the markings appear to be 'internal' i.e there are no physical marks or scratches on the surface of either pane of glass.

Does anyone know whether permanent marks can be imprinted on frosted double glazed glass by a laser from a laser pointer or similar? I have some markings in the shape of x on my glass door which only show up at night against street lighting. They appear to have been hand drawn by something like...

I am trying to research the effect of a laser possibly from a laser pen or similar on frosted double glazing. I have strange marks on my frosted double glazed door frame which are being caused by a laser light. They can only be seen at certain angles at night and against street lighting. Can...

Can anyone help me please. I live in England. I have a front door and frame part of which comprises frosted double glazed glass. I have noticed marks of an x obviously hand drawn in some way on the glass. These cannot be removed by cleaning materials. They only show up at nightAt certain angles...