The black and silver and white and silver sample photos look like they may be using HASL surface finish (aka, solder).
If you're handing out business cards with a HASL finish, make sure to spend extra for the lead-free version.
If you're handing out business cards with a HASL finish, make sure to spend extra for the lead-free version.
Inside the .zip is a README.txt and Elecrow.png
If the user selected "silver" the readme and image shows to select HASL lead free
:)