I want to decorate a wedding cake with ribbon and a bow in black
fondant or gum paste but I can't get it to go black. I end up with a
dark grey or charcoal. I am using wilton paste color. Help!!

If I were you I would buy the ready made "satin Ice fondant" in black. It is very hard to get your fondant colored black. It tends to get sticky and greyish colored

If you use MMF, I always add the color to the melted MM to get a dark black.

Im with cakeRN I always buy my black and red in the satin ice so i dont have to fool with trying to get the right shade

anytime I've needed black fondant I've had no problems getting it dark black if I make MMF and add the colour while the marshmellows are melting (as cathie_shinnick suggested) and then letting it sit for a few days wrapped up in the fridge. I've also made chocolate MMF first and not had to use as much black colouring.

If you have access to Americolor brand food colors, use Super Black and add to the melted mm. Wilton requires too much color if you can even get it black to begin with. Wilton black also tastes bitter when used in large enough quantities to get dark black. Americolor = no bad taste

i did this before and found that if you start with chocolate mmf and add black it works quite well.

Thanks a million folks. I tried adding the color to the marshmallows
while they were melting and it worked!!!!!
I am GRATEFUL.