I work for a small electrical engineering company. Our products are not presently RoHS, but we're planning to switch over. As best I can tell, this is a matter of ensuring that our individual components are RoHS, and using lead-free solder. But what documents do we need to keep on hand? Do we need a file of letters from each component manufacturer? Or is it enough to glance at Digikey and see a green leaf next to the component name?