I have made a cake topper out of Royal Icing, but it's not as red as I need it to be. Is there a way that I can paint it, or add colour to it at this point? Thanks for any help.....

if you have red petal dust (or lustre dust, if a metalic look is ok) will solve the problem, you can just dust it on.
you can also mix the dust with vodka, or dilute gel colours with it, and paint on.
xx

Unfortunately I don't have any red lustre dust, just white and silver. And all that I have red is Wilton colours, can I mix that with vodka or something to make a paint??

mix it with vodka, or any alcohol, and you can paint with it. i havent personally done it on ri, but im sure i have read it works fine, cause the alcohol evaporates so quickly. might be tricky getting a perfectly even finish though.
xx

Thank you so much.....fingers crossed!!

You can certaintly paint it on Royal Icing no problems, I have done it plenty of times before, don't drown it in the paint mixture and make sure the RI is dry before you start.

As mentioned, only mix it with alcohol because it does evaporate quicker and does not soak into the RI.

Best of luck,
Kim