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Tony,

Thanks for looking into this. I was planning in buying in bulk (1000 would be what I would buy initially).

I'm based in Belgium. I did notice polystyrene wasn't any good - that was my previous attempt ... I have looked at catalogues of live sciences material suppliers but am completely out of my depth there, with no idea what I would need (apart from avoiding polystyrene). I did find something possibly suitable in the catalogue of Entomopraxis in Barcelona "Tubo de fondo plano, polipropileno ultraclaro, 15 x 50 mm, volumen 5 ml, graduados a 2,5 y 5 ml. Tapón blanco de polietileno a presión. Precio los 10 tubos" costing 1,20+taxes for 10 pieces. Anybody experiences with these or with other bottles ? I guess I can keep the collection mostly in the dark.

Thanks,

Joris

--- Later note: I ordered the tubes from entomopraxis and received them quickly. They seem OK with regards to cost and size, but I'll see how the hold up to the alcohol. This should be fine as they are made of polypropylene. ---