[octofish]

Your times are definitely too long. The mixing chambers were still sold new not so long ago bu Fotoimpex in Berlin. Is this what you mean? http://www.fotoimpex.de/cgi-bin/shop...otolabor&range ub2=Vergr%F6%DFerer%2DZubeh%F6r&vendor=Meopta&pn=1 2&sort=0&items=

Argh so close! I hadn't seen that and got excited for a sec, but unfortunately it's for the meograde not the meochrom which i have. It's similar but is a different shape, so I don't think it will work. They don't seem to carry the ones I need. Thanks for the link though.

I bought some artists acrylic in titanium white which the lady in the shop thought might be ok for the application, but I'm not so sure about the heat resistance and colour of reflected light. I'm going to do some tests first. It probably can't be much worse than it is currently though...