I run test reds, purples and blacks all the time plus dark colors as I have had them put excess dye on to many projects. Put in hot water and squeeze a couple times, if water is clear -hang them to dry and press. Most of the sizing is still in there so they are still crisp. If they bleed, I use Retayne and Synthrapol to get excess dye out.
Just had 3 reds that bled like crazy. Thank goodness I tested them before putting them into my applique.