Only dye your carpet if you are sure it is wool or nylon.
Can you re dye a dark blue carpet to gray.
The color you chose to dye your carpet is dependent on the previous color of your carpet.
For example if you have a blue carpet and you decide to paint it red the resultant color will be purple.
Dye carpet give your plush a fresh clean stain free reboot with the guidance here.
But keep in mind it will be permanent so be sure you can commit before you proceed.
Some local fabric carpet and home supply stores as well as a variety of online retailers sell carpet dye in an assortment of standard colors.
Choose the right carpet dye for your carpet.