I followed the package directions. It was straight forward.
I Used a 10" dia x 12" tall pot.
Placed the belts in and added water to cover the retractable pieces (1" above)
Add two containers RIT liquid dye
Add 2 Cups Vinegar
Bring to a simmer, lower heat a bit then let stew for 45 minutes.
Remove from pot and Cold water rinse. Then Dry.