Dye's Don't Combine with Fade Effect on Firework Star

When creating a Firework Star that already has a color (let's use purple) and then you later combine the color with dye's to get a "fade" effect (let's say Lime Green and Cyan). When you combine a star with the "fade" effect with other dye's (let's say Gray and Pink), the dye's before the combination are no longer on the star.