This one caught my attention: What interesting devices could be created with it? Cheers, Isaac Em 31/05/2018 02:43, William Westfield escreveu: >> - 4. Al cooking foil (non adhesive backed). Cheap, available, lower refl= ectivity > Are you sure about that "lower reflectivity=94 part? Is cooking foil dif= ferent in different parts of the world? (in the US, you get one dull side = and one very shiny side.) Ancient amateur =93solar power=94 books used glu= ed cooking foil almost exclusively. > > thickness may matter. Some of the aluminized mylars are designed to be p= artially transparent. > > >> cooking, water heating and water sterilisation. > You might want to consider copper, which is quite reflective in IR. Norm= ally pretty expensive, but perhaps with surplus PCB material=85 > > >> - 10. Front surface silver mirror using silver nitrate + clear coating. > Possible explosive residues; it would make me nervous in the quantities y= ou=92re talking about. Also, I think you need a really smooth surface (ie = glass) to get a reflective layer. > > > https://www.photonics.com/a25501/Mirrors_Coating_Choice_Makes_a_Differenc= e > > BillW > > --- Este email foi escaneado pelo Avast antiv=EDrus. https://www.avast.com/antivirus --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .