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I mix red and blue to get purple, but get grey!!!!

post #1 of 17
Thread Starter 
I need to made purple fondant next week for my daughter's Rapunzel Tower birthday cake.

Today she and I were mucking around decorating cookies with royal icing and I decided to have a practice with the colours, thinking it would be straightforward. But no - I mixed a little natural red liquid food colouring and a little blue into my white royal icing - and it went grey instead of purple! What am I missing?! I'm trying to save money and use what I have, but am I going to have to buy violet colouring? I need a couple of different shades too!
post #2 of 17
Yeah, I never get purple without actually using violet or lavender coloring. Or even just buying lavender fondant. Maybe someone else has a secret, but I always hit that roadblock, too.
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post #3 of 17
I make my own purple/lavender colors all the time and I use that same technique, Mixing red and blue. but like we were taught in grade school doesn't work exactly that way with fondant or icings. First I make my frosting or fondant blue and after it is well blended in I add the red to get the shade/hue I want. If you use red first you have to add the orange to get the red so that's why I use blue first. The deeper the blue the deeper the color purple.

HTH

I just finished making lavender for ribbon & bows for todays cake. Came out perfect.
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Virginia 323.253.8213
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post #4 of 17
auntginn, I'm confused on why you need to add orange to get red....
On the grey thing, it might be your red; all reds are not created equal. What are you using? I like the Americolor super red. If you have an orangey red, that could be adding the yellow that would turn the purple grey. (If you mix purple and yellow, you will get a grey) That is why some people add a dot of purple to their buttercreams that have a large amount of butter in them. It neutralizes the yellow from the butter.
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post #5 of 17
The ph balance of your fondant is off. Add a pinch of baking soda to your fondant, then add your colors and it will help. Purple is really hard to get, but the baking soda will solve your problem.
post #6 of 17
Quote:
Originally Posted by FromScratchSF

The ph balance of your fondant is off. Add a pinch of baking soda to your fondant, then add your colors and it will help. Purple is really hard to get, but the baking soda will solve your problem.



she said she was messing with royal icing today tho icon_confused.gif

i agree about adding the red in with the blue...it's really hard to mix colors if you use half and half of each color. unfortunately, it doesn't work the same with food coloring as we learned in school icon_razz.gif
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It's not "just" cake...it's my life!
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post #7 of 17
She also said she was using liquid food colors. Use gels! Americolor is sold at Hobby Lobby and it's better than Wilton...but even Wilton gels are better than liquid.

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post #8 of 17
Its best if you get a color wheel to understand colors. But if you have fondant already colored you can use this chart from Satin ice.
Remember everyones monitor is different and may vary.
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post #9 of 17
I missed the royal icing part, I thought she said she needed to make purple fondant. Well, can't help with the royal, that should be no problem.
post #10 of 17
I've mixed pink and blue before to get purple, after having the same problems with blue and red.
That might help.
post #11 of 17
I also use pink and blue to get purple.
post #12 of 17
Thread Starter 
Thanks you all sooo much for all the replies! I suspect the red colour is the culprit, I was using Dr Oekter natural red liquid colouring, and it was a weird texture, kinda gloopy? Both my red and blue colours are brand new and bought this week from the supermarket, so don't think it had gone bad, but I suspect the natural red was not a "true" red, as someone mentioned in their reply. I'm going to try a test with colouring a little fondant red then adding blue, if that doesn't work I'll be off to buy new colours.

I'm only just getting into this cake making lark, so still using amateurish colours - definitely need to get into using gels if I'm going to do this properly! Thanks again everyone!
post #13 of 17
Quote:
Originally Posted by milkwithonesugar

Thanks you all sooo much for all the replies! I suspect the red colour is the culprit, I was using Dr Oekter natural red liquid colouring, and it was a weird texture, kinda gloopy? Both my red and blue colours are brand new and bought this week from the supermarket, so don't think it had gone bad, but I suspect the natural red was not a "true" red, as someone mentioned in their reply. I'm going to try a test with colouring a little fondant red then adding blue, if that doesn't work I'll be off to buy new colours.

I'm only just getting into this cake making lark, so still using amateurish colours - definitely need to get into using gels if I'm going to do this properly! Thanks again everyone!



you will not be able to make fondant a color with the liquid food coloring from the supermarket. plain and simple. you either need paste or gel colors that you can get a michael's or hobby lobby.
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WI State Representative for Icing Smiles...start 'Baking a Difference" today!
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It's not "just" cake...it's my life!
WI State Representative for Icing Smiles...start 'Baking a Difference" today!
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post #14 of 17
I agree with stepOnmi, supermarket colors are #1 not concentrated enough for the use and #2 usually contain too much water which will make the fondant very sticky.

When I make red, I first add orange to fondant or icings to break up the white, then add the red. This way I will get red and not pink. (red & white = pink even if you add a lot of food coloring)
Virginia 323.253.8213
www.urbanainez.com
He is the man of my dreams, my prince; He gives me the desires of my heart, He completes me. His name is Jesus
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Virginia 323.253.8213
www.urbanainez.com
He is the man of my dreams, my prince; He gives me the desires of my heart, He completes me. His name is Jesus
Reply
post #15 of 17
Thread Starter 
Update - tried adding the red to blue fondant, still got grey - definitely must be a dodgy red. Have got along OK adding liquid colour to fondant so far, but this is the end of that road I think! Off to get gel colour this week then! icon_smile.gif

Thanks again to everyone who took time to help me!
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