Cannot save CMYK black to k100

[Improving]

Hi,

I have a svg barcode and also a pdf logo. Two different files from two different sources. Both hat back only components, which are CMYK.

When I open Illustrator and select all, then go to the colors and change to K100, all seems to work. Then I save (tested localy, on a served, same name and different name), close the file, reopen it, and the back is again CMYK.

I can add other compontent and those save, so it is just the color I might be using wrong somehow?

I have also tested with Versions 28.0, 28.7.3 and 29.1, so it must be something I am doing wrong. Is there some kind of "save black as cmyk in illustrator"?

Any ideas, what I could try?

Thanks!

[Improving]

Not even File > Document Color > CMYK worked, but finaly I found a way. I changed it to document CMYK and then saved as ai format, that kept the K100..... finaly. 

I assume maybe the svg and pdf for some reason didn't keep the CMYK selection.

[Monika Gause]

SVG is RGB only. It technically can't keep 100K

The PDF might have had settings applied that always converted your colors.

[Ton Frederiks]

Try using 100% Grayscale instead of 100% K

[_scott__]

You'll also want to check the Settings/Preferences. Specifically "Appearance of Black" and set BOTH those drop downs to "Accurately" -- Especially the Output if you are working with CMYK files.

Why this is NOT the default setting utterly mystifies me.

SVG files are or RGB color... no such thing as 100K in RGB.