Yellow plus Green does not make Blue

[Numberfour]

A woman I talked to yesterday (where and when is irrelevant), thought that if you mixed yellow playdough with green playdough you would get blue playdough.

Was I unreasonable to be a Bit Surprised? Surely something like that is really basic general knowledge?

yes, it is
but confusingly on a computer it's red, green blue
I do not get how red & green make yellow...but apparently they do

I have to say this has not caused my heart to stop beating, my brain to start itching and the shock factor is taking a while to kick in. It's definitely not an opinion that I would have taken issue with - if she's happy believing that then who are you to be A Bit Surprised?

Therefore YABU

No. Yellow and blue make green.

On which planet do red and green make yellow? Can you take us there?

The primary colours of light are red, green and blue. The secondary colours are yellow (green and red), cyan (blue and green) and magenta (red and blue).

But yellow and green to make blue. No.

Red and green make brown.

You can show it yourself with some coloured filters and a screen.

so how do red and green make yellow, when they just don't
I have play dough, I have tried it :o

Light. Not playdough.

Here

Primary colours of light work differently to primary colours of, er, colour. If you look at your old telly close up it's all made of tiny red, green and blue blocks :)

but but
is playdough not just light in dough form?
No?
bedtime i think

No, playdough reflects / absorbs light. V different from light being in "dough form".

For us mere mortals, however, surely in paint and playdough and the like, it is sort of VERRRRRRRRRRRRRRRY common sense that yellow and blue make green ???

No. It usually makes brown. Sludgey brown

LOL!! that was the woman in question's dilemma! she did not want to give children green playdough and blue playdough (or whatever colour it was!) because it would all become sludgey!

Eventually she gave in good humouredly and let the kids play with more than one tiny pot of playdough. As far as I noticed, the sky has yet to fall in!

Lolat curry spice.Eventually all playdough makes brown.I thought yellow and blue made green.Must be thick!

Maybe she had chicken pox that week at primary school?

Yellow and green just makes yellowy green.

Yellow + blue = green

Yellow + red = orange

Red + blue = purple

playdough + playdough = baby poop

Yellow + green = greeny yellow, BitofFun, not "yellowy green" [deep in despair emoticon]

Blah blah, you knew what I meant

Anyway, DP is saying yellowy green, and he's an artist, so I'm going with his version

Play dough is pigments, the primary colours are red, blue and yellow. Mix them all together and you get brown.

Primary colours of light are red, blue, green. Mix them together in equal proportions and you get some shade of grey, ranging from black to white.

It would depend on the quantities of yellow and green as to whether it came out 'yellowy green' or 'greeny yellow', not the order in which they were mixed.

And I'm an art teacher

"Primary colours of light are red, blue, green. Mix them together in equal proportions and you get some shade of grey, ranging from black to white."

Er.... are primary colours not yellow, red and blue and when those pure colours in light form are blended, it makes white? Black is the absence of colour.

ah well, you learn something new every day