Why do shapes painted in color C=0 M=0 Y=0 K=0 and having an overlay blend mode disappear when separations preview is enabled?

Question

Seal

It is also interesting why a white border appears around objects with a red color?
If objects disappeared in the separations preview mode, does this mean that they will also disappear when printed?
How to paint white objects in such a way that they do not disappear, and what is the reason that they disappeared in this case?
The color C=0 M=0 Y=0 K=0 is also used to color all the white objects in the "text" scene, why don't we see them disappear?
Perhaps transparency and blending modes somehow affect the process? I have 10% opacity on the parent group with the blend mode set to overlay.

Can the Overprint Fill option help in this case?

Answer 1

Why do shapes painted in color C=0 M=0 Y=0 K=0 and having an overlay blend mode disappear when separations preview is enabled?

White color in printing (read: in CMYK mode) means the absence of colors (0 / 0 / 0 / 0). Vadik! Color spaces have different logic! Well, when will you read the theory already?) In RGB, zero values ​​mean the opposite - black (0 / 0 / 0).
I myself love the toaster format, and unlike others, I don’t criticize noob questions, but believe me - the logic of color spaces and prepress needs to be thoughtfully studied.
I do not see the border, give me an enlarged image
Keep Separations Preview enabled and experiment with overlays. They disappear because you are trying to impose the absence of colors , it's like dividing by zero. Such an algorithm is specific to Overlay and some other modes.
What are these objects? Didn't understand.
Transparencies, effects and overlays VERY influence in polygraphy) In RGB they are not badly affected (layouts always whine because of this), and in polygraphy this can result in very serious problems. Therefore, printing houses are often obliged to collapse the layout into one raster layer so that later they don’t have hemorrhoids with such jambs as you have on the GIF.