Hi,
in odoo 10.0 i used attribute colors on tree for set color lines like this:

<field name="arch" type="xml">
    <tree string="Question" editable="bottom"
            colors="maroon:text_color=='maroon';
                    red:text_color=='red';
                    purple:text_color=='purple';
                    fuchsia:text_color=='fuchsia';
                    green:text_color=='green';
                    lime:text_color=='lime';
                    olive:text_color=='olive';
                    yellow:text_color=='yellow';
                    navy:text_color=='navy';
                    blu:text_color=='blu';
                    teal:text_color=='teal';
                    aqua:text_color=='aqua'
                ">

I see that in Odoo 11.0 this doesn't work, and instead of colors it's possible to use bootstrap class like decoration-*name ... the problem is that i need more colors than just danger, warning, info, muted, primary and success like the cookbook explain.
There is some way to do that?