The phrase 'it's mixed' is correct and usable in written English.
It can be used when describing something that is composed of various elements or components. For example: "This recipe uses a variety of ingredients - it's quite a mixed bag."
Exact(60)
Nothing says spring like that cool, robin's egg blue, especially when it's mixed with vibrant green moss.
The lesson: never play a song to its subject, named or otherwise, until it's mixed, mastered and released.
"It's mixed media," said the woman who'd made it, Nicole Kaplan, Del Posto's pastry chef.
When it's mixed with water, an endothermic reaction gets created, releasing baking soda's antiseptic nature.
"It's mixed," he said.
It's mixed media.
"But it's mixed".
"It's mixed emotions.
JULIA IOFFE: It's mixed.
"It's mixed," Ms. Peard said.
"It's mixed emotions for sure.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com