I couldn't found the directions of using the proper prepositions with the verb to turn.

What is the right way of usage: to turn to, to turn into or to turn without any preposition? Especially in the context of colors changing.

The red color turns ... pink when adding the white.


You can use to turn into/to as both are valid because the color changes into or becomes (read the definition).

That said,

The red color turns into/to pink when white is added

If I believe my sense, without any preposition also it'll look okay.

The red color turns pink when white is added.

At least, there is no ambiguity.

From a Chemistry research paper, I found:

Above pH 8.2, phenol red turns a bright pink (fuchsia) color.

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