On the chosen Raw Material's page, you can show all the Variants/Colours ever created, including the ones not visible in the current season and any colours/variants previously made inactive.
From the Raw Materials list view, click on the Raw Material ID and go to the Variants tab
Within Variant Details select [Include Invisible] to view other variants not visible in current season
Tip: Invisible variants greyed out
..and [Include Inactive] to include variants/colours previously inactivated
Tip: Inactive variants greyed out with strikethrough
Select the Variant and flag the check boxes accordingly to make it active and visible in this season and select [Save]
Ensure your seasons are set up correctly to ensure prices come through, for more information on setting up Seasons