1

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.

2

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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