Ends of Hair will not take hair color

I'd assume that your ends are more porous because they've been dyed more times.  Usually ends absorb too much pigment though, then it washes out faster than it does in the rest of the hair.  Its unusual that it won't take. 

Are you using a heavy silicone conditioner?  Maybe that is interfering with your dye if you are.  (Any words in the ingredients that end in cone or one are silicones, the higher up they are in the ingredients the more there is).  If that is your problem, you could clarify your hair with a clarifying shampoo to remove buildup before you dye it, use a no cone conditioner after you clarify, then wait a day or two before dyeing it so your scalp can build up some protective oil first.  Your hair will be very dry after clarifying, you may want to plan to wear it up so it doesn't get tangled in that day or two before you dye it, then dye it, and condition it really well afterwards (you can use your silicone stuff again after).

If its not conditioner build up, and its porosity, you could try a protein filler on the ends, but there's no guarantee this won't make it look uneven because of the line where you put the filler.  You could test strand it to see. 

Another trick to try is doing your ends first and leaving the dye on for longer, then doing your upper hair last.  I would test strand each thing and see what you get though, don't try all these at once.  Hope something helps.

SUBJECT: ENDS OF HAIR WILL NOT TAKE COLOR.
Thanks Susan for taking the time to answer my hair problem....I see why you are an elite member. Yes, you hit the nail on the head....the ends of my hair are VERY porous. I use the conditioner that comes with the Natural Instincts or any other color that I use. Of course, the ingredients are not listed, but I will check that out on any other conditioner that I might use. I have used a clarifying shampoo before coloring and that did not work either...I've tried so many things except cutting off the bad hair....but since I wear my hair necklength, the 5" is the predominate part of my hair and I can't wear my hair THAT SHORT! I will try the protien, but don't know for what to ask....I can go to Sally's.
THANK YOU SO MUCH! YOU ARE A DOLL!

SUBJECT: ENDS OF HAIR WILL NOT TAKE COLOR
fakeizme,
Love your name....sounds like me...everything is fake! HA!
Thanks for the tip...really do appreciate your input. I'll look for something as I normally do not use any leaveins as my hair is fine and the least little thing pulls it down. I suppose I could find something at Sallys...do you have a product particularly in mind? But before a color job, I can do that and hope it does the trick also. What a GREAT forum...I should be back to normal soon with such caring advice.
THANKS!