So, what do I do with 4X5 film once its exposed? I'm not sure what to do to make sure it remains unscratched, dust free and light tight from film holders all the way to the lab. Until i finish setting up my home lab this is an issue for me. Anyone have any advice? i realzie this is extremely basic, but i'm shooting 4x5 for the first time and don't want to ruin any film i've already exposed.