Sorry, I use americolor super black. I take any left over colors I have and mix them all together, then add enough til it gets black. If you are starting from white, try adding in any other colors you have first, like blue, purple anything dark. You can also add cocoa powder if you dont mind the chocolate taste. Americolor works great.
It's not so hard to do. I learned that one from this site. You need to first color the frosting another color such as blue or brown to break up the white then add in the black.
The reason it stays grey is for that reason, you are adding it to white. If you add another color the black will hold better.
HTH Good Luck
Do you have any other colors you also need for your design? If so, make those first, only make a little more of each than you need for the design. Then put the exta bits into a bowl and mix together. You'll get a nice nasty color. 
Then, add black to that. As with any of the darker colors, it also helps to let it sit for a while to deepen. Just remember to keep a moist paper towel or a a piece of plastic wrap sealed over it to keep it from drying out or forming a crust. Royal matures a bit faster than BC, a good hour or two should be enough. I always shoot for a dark gray when making black and it always matures to a black. HTH!
I know this is an OLLLLD subject but I need help ASAP and everyone has different answers now matter where I look on the web.
I made royal icing. Added wilton black. Turned purple OF COURSE cause this is just my luck. I need to turn it back to black. No other color will do, not a shade of grey, nothing...HAS to be black.
Helppppppppp plsssssssssssssssssssssss!!!!
wilton colors take time to develop and you need to add quite a bit, try adding more, spread some real thin on a white plate or something and let it dry to see if it dries black. Then for your next project I would recommend americolor. I hope this helps.
Unfortunately, it's for a wedding cake due this week. I didn't think I'd have such an issue with this! There HAS to be a way to counteract the color. It is now puke green in color.
All in all, I am getting extremely discouraged with Wilton products. Their fondant tastes horrendous, the frostings taste horrid, their colors aren't pleasant to work with, and their plastic cut outs for flowers are really poor quality.
I see why everyone uses other brands. I think they are just a name, that's it.
This is the 2nd project I've tried working on in the last month using their colors. UGH UGH UGH is all I can say!!
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