If your colors are two dark...just add more blending solution...if you want to add more color, just put some on your felt and dab away. You can also add blending solution directly to your paper. Try different colors.
You can use regular cardstock with alcohol inks. Because it's absorbent, it will take more ink to cover your paper. When you use regular cardstock, you can use regular dye base ink. Clean your work surface by spilling a little blending solution on your stains and wipe with a dry disposable cloth. If you get any stain on your clothes, the blending solution will take it off. Keep in mind that it is alcohol based and is flammable until it dries...15 - 20 minutes. Well, I hope you had some fun. If you have any questions, please email me at email@example.com. I'll be glad to answer any that I can. Tim Holtz also has a couple U-Tube videos that you can watch.