Being colour blind I can not see one.
What is the number?
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Don’t know Bretrick, but it’s given me headache…
You colour blind as well?
Don’t stare too long, if you could see a number, you will see it instantly 
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Those with normal colour vision see a 5.
Those with red green color blindness see a 2.
Those with total color blindness see nothing.
I see nothing but a sea of coloured dots 
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I saw a 5 as I scrolled past. Good to know that something is “normal”. 
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Yes, I got 5 straight away.
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You’re normal then, at least your eyesight is normal
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Eyesight yes, not sure about me. 
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What time is it where you are?
At the third stroke it will be 8.24am
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Wow"! 25 past midnight here.
Guess I’d better go to bed. Good night.
Night Night. I am having breakfast. Scrambled eggs and bacon. 
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I can see it now but not before you said.
I could see a naked female figure though,perhaps it’s just me.
Edit:It doesn’t look like the original picture you posted to me come to think of it.
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Yes, I think the one originally posted was not the one I wanted to post. Well spotted. 
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I had to do a colour blindness test when I joined the GPO Telephones as a teenager in the UK and much later when I joined the Electricity Commission of NSW.
Both times were tests like the OP they threw in some with no numbers as a check too (perhaps a colour Blind person would have seen a number)
Wiring colour schemes must be tricky if you are colour blind.
I remember these pictures from school. A school nurse came and tested everything in those days. I hope they still do that.
Come on Bretrick… 
That’s a different picture to the one I saw last night…
This seems to be the original picture , I’m still trying to figure out whether it’s a part of the human body…:
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I think it might be a number in a different language
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