Using colors in App Inventor is always very special. @Patryk_F already stated it in this topic.
In the designer we have HEX values to work with
In the blockseditor we have RGB values to work with
And when you use Do it you get the color back in the form of an integer.
All in all this is very confusing to a beginning or even an more experienced user.
I think this should be changed. After a Do It the result should be put in HEX and with the make color block the user should be able to use hex values.
I know it can be done the following way but it is not very intuitive.
Wondering how you think about this.