I recently gave an all-American effort to extending the life of two worn and loved pairs of jeans.
I searched and found a few blogs detailing their results in similiar quests.
Armed with this information, I decided to run my 2 pairs of jeans through the washing machine with 1 bottle of RIT navy blue dye, combined with one packet denim blue dye.
After the navy and denim blue dye:
My dye choices left me with an unreal, indigo colored hue. (It's more obvious in real-life, than in the picture. My old jeans are now utterly lacking any charm whatsoever in this new hue.)
So I ran both pairs of jeans through the washer again, this time with half of a RIT black dye packet.
After doing a cycle in half a packet of black dye:
This certainly improved the color, but it still isn't perfect. If I did this again, I'd use the navy blue dye with black dye (instead of denim blue), in an effort to get the super, dark jean look. Not get a primary color as I did. :)
The "denim blue" RIT dye is too indigo based. I've done a pair of jeans before with just that color, and it's definately not the blue jean color that I love.
The suggested ratio that I found on a blog somewhere was one packet of navy blue dye to 1/2 packet of black dye, for one pair of jeans.
So maybe my experience will help someone else out there hoping to revitalize their favorite faded jeans...