Mrcheerful wrote:


so what is actually needed (dragon's den here I come) is a paint tin
that can be made shorter, perhaps collapsible corrugations ? or an
inner cup that could be screwed inside the can and would then
effectively raise the bottom surface of the can.

Back in the days before digital cameras, we used to use collapsable plastic
jars for chemicals used to process film and prints. Same reasons - keep the
volume of air contained inside to a minimum.

--

-Mike-