if you go further into the earth disk, you will find ocean of other chemical substances, I don't understand why do you guys think its unrealistic?
Because there is absolutely no evidence or rational reason to think that is the case. Especially with Earth being round and thus these oceans not existing.
But importantly, many of these "chemical substances" are actually quite complex mixtures which you have provided no reason to think would exist there.
All oceans are still blue, they look exactly the same as oceans you see here in our world. Its just they don't taste the same because there is different chemical elements in them. Yogurt ocean is still blue, but if you were to taste it it would actually taste like yogurt.
If it is still blue, it isn't yoghurt. Or are you suggesting that it is just water with a little bit of yoghurt in it? If the latter, it wouldn't taste like yoghurt.
Again our ocean is the ocean of Salt, but notice that even thou our oceans are salty, that does not influence the color of the water! I hope that clears things up for you.
And do you know what the colour of salt is? It is colourless.
What you are suggesting now is akin to suggesting that putting food dye in water wont change its colour, and we all know that is nonsense.
In general, unless a chemical reaction takes place, dissolving a colourless compound into a colourless solution/pure substance will results in a colourless solution.
Dissolving a coloured substance will result in a coloured solution.
When mixing 2 liquids, unless a chemical reaction takes place or you have solvochromatic effects, the resulting appearance will be a mix of the 2.
For example, if you add milk to water, it will still be white.
Yes, if it is dilute enough, it wont be noticeable to the naked eye.