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Calling all experienced bakers & cake decorators!
How would you make this rainbow cake?

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20 replies to this topic

#1 Moneypenny2014

Posted 17 January 2013 - 10:24 PM

Ok so I'm fairly good at baking and this is what I'd like to bake for DD's 4th birthday in a few weeks time. I love the idea that all of her friends can join her in blowing out the candles (after she has had the first go she tells me!!).

CAKE HERE: http://pinterest.com/pin/230739180879963966/

But, I'd like some advice as to how you would best prepare the individual coloured section given they are sandwiched vertically.

My only thought was to buy a small sized tin and re-use it over and over baking one colour at a time! I'm thinking that would take ages unless I bought a few of them (but I dont really want to go to the expense).

I guess I'd also start off with say light coloured mixture and then slowly darken it for each layer.
Finally, sandwich the whole thing together with butter cream icing and put sprinkles and candles on top.

I'd love some thoughts on the best tins to achieve the individual coloured layers would be fantastic!

#2 treefalls

Posted 17 January 2013 - 10:38 PM


That looks amazing and I must say I do love an ambitious birthday cake. My husband pulls out his hair at the things I attempt! LOL.
I just made a cake in the shape of a possum for my son for his 3rd birthday and am planning another major Mad Hatter's Tea Party thing for his party in a couple of weeks...

My most immediate thought is that I would say that is a cake I would not attempt. HOWEVER... as I also like a challenge biggrin.gif, I have given it some thought.

I reckon you could make the layers in a large rectangular tin. Mix up the colours as you suggested and spread the cake batter in stripes inside the tin to save time and then trim them all to size at the end. You'll have some wastage but that's the only way I can think of to bake multiple colours at once.
Have fun!!

#3 Glowworm80

Posted 17 January 2013 - 10:42 PM

I made a marbled rainbow cake once. I made a basic vanilla mixture then coloured them individually in lots and lots of bowls. Using gel colours would allow you to graduate the colours in the mixture better then liquid ones.

As for the baking part all I can think of is to use a square baking tin and construct a tinfoil barrier in a cross pattern then fill it with similar colours from each corner. Let it settle pull the barrier our gently. Once baked just trim the cake slightly where the colours meet.

Good luck and please post pics when you have done it. Love looking at cakes!:-)

#4 Acidulous Osprey

Posted 17 January 2013 - 10:44 PM

A friand tin?

#5 skae

Posted 17 January 2013 - 10:47 PM


The original baker of the cake describes her method here original.gif Good luck!

ETA - if you follow the links thru you get to a different tutorial: http://www.chocolatesuze.com/2009/12/04/20...er-rainbow-cake

Edited by skae, 17 January 2013 - 10:50 PM.

#6 greengoddess

Posted 17 January 2013 - 10:48 PM

Any of those suggestions above would work, but one word of caution - you will need to colour each batter separately. Personally, I'd probably use a loaf tin and just bake lots of separate layers. You'll find they cook faster if they are thinner, so it might not take as much time, but it still will take time.

Don't just add colour as you will end up with a muddy mess and no distinct colours.

Do add pics when you're done!!

#7 AnotherFeral

Posted 17 January 2013 - 10:49 PM

Disposable foil containers? I think the Woolies home brand ones would actually be quite a good size. Kmart sells slightly wider ones if the woolies ones aren't suitable. I know some people use foil pie dishes for those stacked round rainbow cakes.

#8 Megs25

Posted 17 January 2013 - 10:54 PM

If you want it to look nice, the only way to do a cake like that is to make the batter, split it into how many colours you want, colour each lot of batter and bake each layer separately.

They won't take long to cook, and any other method is just going to leave you with a murky mess of a cake.

#9 Moneypenny2014

Posted 17 January 2013 - 11:14 PM

Skae thank you SO MUCH for finding the instructions!! I had tried myself but with no luck!

#10 imamumto3

Posted 18 January 2013 - 06:21 AM

QUOTE (Megs25 @ 17/01/2013, 11:54 PM) <{POST_SNAPBACK}>
If you want it to look nice, the only way to do a cake like that is to make the batter, split it into how many colours you want, colour each lot of batter and bake each layer separately.

They won't take long to cook, and any other method is just going to leave you with a murky mess of a cake.


I have made the standard round, vertically stacked cake.  I made the batter, weighed it and then separated  the batter into individual bowls, weighing them so that all the layers would be the same size.  I used 2 good quality round non stick tins, the cakes cooked really quickly, 8 minutes I think.  then I turned them onto wire racks to cool while using the tins for the next layer.  the cakes cooled really quickly too.  

for that cake I would probably buy 2 small square tins from a specialty cake decorating shop, or victorias basement if they had them because they can be quite cheap. then you know that the layers would all be the same size, making construction a breeze

eta.  just found a 10cm square tin online for about $18.  that was just looking at one website, you might be able to find cheaper or be able to higher a couple of tins for a day

Edited by imamumto3, 18 January 2013 - 06:29 AM.

#11 Awesome101

Posted 18 January 2013 - 06:34 AM

I did something similar with my daughter cake recently, except I didn't want to muck around with the cake batter. I made a white chocolate mud, left it white but coloured the buttercream icing and spread it thicker than the picture shown to give that effect.

#12 Bunsen the feral

Posted 18 January 2013 - 07:33 AM

Following the original bakers instructions that cake has 270 servings! It's going to cost a fortune just in cake and icing not to mention colouring - to get those bright colours you need gel colours, supermarket liquid ones won't cut it. Gels are around $4 each.

You'll need to bake fairly thick layers or it won't stand up - as it is it will be quite difficult to ice without it falling over and crumbling. Use bamboo skewers to hold it in place if it's not stable.

When are you planning on making it? Hot weather is not your friend if your structure is dependant on butter cream to hold it up!

Personally, as a fairly experienced cake decorator, I wouldn't attempt this unless it was winter - I would do a regular rainbow cake (google Martha Stewart for a fantastic one) and a big line of rainbow cupcakes for the candle effect.

#13 imamumto3

Posted 18 January 2013 - 07:55 AM

you could make fewer layers, maybe one of each colour, not various shades of each.  I think I did 8 round layers with butter cream icing filling & icing.  this was in summer, made in the morning, eaten in the afternoon and it held up fine.

#14 Anemonefish

Posted 20 January 2013 - 08:36 AM

Wow, that cake looks amazing! Good luck, OP, and do post a photo. I would divide up the cake batter into separate bowls to colour it rather than what you suggested.

#15 TopsyTurvy

Posted 20 January 2013 - 09:10 AM

Rather than attempt to bake all those cakes at once, I would do them over a few days and then cool and freeze them.

So day one make up 2 cake mixes, portion out and weigh your different batches.  Do the yellows and oranges.  

Next day do your reds and pinks.

Next day blues and greens.

Next day purples etc.

Once you have it all baked then defrost and assemble on the day of the party.

The disposable foil tins will most likely be your best bet, if you are careful though you should be able to wash and reuse them.

#16 unicorn

Posted 20 January 2013 - 09:38 AM


I like the idea of rectangle muffins. *toddles off to eBay*

And speaking of eBay, you can buy a box of gels at a reasonable price on there.

Edited by unicorn, 20 January 2013 - 09:42 AM.

#17 JustBeige

Posted 20 January 2013 - 09:59 AM

QUOTE (unicorn @ 20/01/2013, 10:38 AM) <{POST_SNAPBACK}>

I like the idea of rectangle muffins. *toddles off to eBay*

And speaking of eBay, you can buy a box of gels at a reasonable price on there.

thanks unicorn, I was just wondering were you get them from original.gif

#18 Moneypenny2014

Posted 20 January 2013 - 10:57 AM

Thanks so much everyone for your ideas I definitely think rectangle muffin tins or foil trays are the way to go as well

#19 Moneypenny2014

Posted 11 February 2013 - 11:40 AM

Just adding a bit of an update here as DD's birthday is just around the corner.
I've decided to make this with horizontal layers of cake/colours as I got nervous from reading some of the replies that it may not stand up properly!
I've decided to use a standard size loaf tin and say 4 cake levels/colours (pink, green, blue & yellow) and cover with buttercream icing. In order to make the cake longer (and because you wont see any joins underneath the icing) I am going to put about 3 "loaf" cakes in a line - does that make sense??
That way when we cut the cake off in slices there will be multiple colours horizontally and hopefully my cake wont all fall apart!!

#20 cuddlebud

Posted 12 February 2013 - 01:40 PM

Good luck - I'd weigh the batter too so that you get even layers, but i'm completely anal about things like that.

#21 Moneypenny2014

Posted 12 February 2013 - 04:03 PM

Good idea

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