Seat fabric

I'm trying to dye the stock seats to try and get rid of the green color and was wondering if anyone knows what's material they are made of.I'm using rit dye so far I've only tried with hot water and vinegar but they've gone blue instead of black. Any helps greatly appreciated.
 
hot water and vinegar?,,,why not get a few spray cans of carpet dye,,,,i used to use this stuff everyday on dealership cars,,,sweaty grey carpet turned to black in less than half hour
 
When i dye fabrics, clothes or shoes... I always use dyelon... first I use the dyelon bleach to geth rid of the colour washing it all out thouroughly then use there colour, washing that out thoroughly :) x
 
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