Connie Birchmeier

I just started making car freshies. The aroma beads have dried and i put them in the oven at 350 for about 7 minutes. When they come out, all the color is gone. I put the liquid dye in after the oil and wait for it to dry. I made some yesterday when they came out they were white again. I keep loosing my color. What am i doing wrong? Thanks for the help Connie