These are the same Placards that we use to make Standers for True Timber and Veil camo to send to there customers to have a standard to compare to there work to make sure the work they are doing matches also you can have a coner with just the base coat to have a reference of the needed color.
I send a lot of these to protective clients they side in a overnight evenlope and you can write notes or directions on the back side
I have also seen people dip both sides to show color differences etc.
approximate size 12" x 12" square , cut about 1/8th " shorter so they can fit in 12" envelope
They have a clear protective film tear off on one side to protect from contamination
No presswork needed for painting and yes you can dip straight to them without base coat if you wish