Is transparency counted as new color in printing?

Thank you for your help. Your answers helped me better understand the concept of CMYK and printing.

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@Fatih28266799rrxr  schrieb:

if I add another red color with 50% opacity, will it count as a new color while printing?

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If you do this with ""opacity" then it does not only depend on how the colors are set up as described by Jacob, but also how the transparency gets flattened. 

You might want to do it as Ton describes and then use Overprinting.

The overprinting concept is not easy to grasp, but when experimenting with designs like the one you plan to do, you absolutely have to.

Fatih,

"My question is, if I add another red color with 50% opacity, will it count as a new color while printing?"

As I (mis)understand it, the answer is yes but it could be no.

If it is to be printed with CMYK inks ("I have red, black and green colors in my CMYK design."), you will need the K for the black, you will need both M and Y for the green, and C for the blue (along with at least one of the others), so you will need all of C + M + Y + K.

If it is to be printed with spot inks, you will need the red, black, and green, as the 3 colours/inks.

In that case the answer to your question is no, if the "other red color" is/can be made from the same ink by using a tint of the full red colour ink/colour.

You can read on here,

https://helpx.adobe.com/search-results.html?q=tint+illustrator&scope=%5B%22helpx%22%5D&subscope=%5B%5D&limit=10&start_index=0&sort_orderby=relevancy&sort_order=desc&post_facet_filters=%7B%22applicable_products%22%3A%5B%5D%7D

Edit: And what Ton said, 3 seconds faster in posting (it said when I did).

You could use a 50% tint of the red color.