I need tips,

Want to redye old black pants that are cool but the color is unsavory now. Any tips, types of eyes I should use? Etc

done overdyes but not redyes

have used natural dyes and have used Rit

Rit is probably easier to use but obviously a little harsher on the environment

they have instructions here:
ritdye.com/instructions/how-to-dye-jeans

hopefully that helps

Imma use this s*** to dye some jackets i bought and never got to wear