> Silver halide crystals are indirect gap semiconductors. > Did you know that? I didn't actually. This fact has sparked my interest to read more about the physics behind photographic emulsions. After I googled (yep a new English word if you didn't know! Past tense of what used to be a noun, but is now a verb - google) these terms, I came across the following interesting read about why silver halide is so unique in it's properties for photography. http://www.madsci.org/posts/archives/nov2000/975608492.Ch.r.html regards Peter Badcock ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.