@Carlos

You could create boolean fields for every color and put those rules in the view definition, like:

from openerp import models, fields, api
class module_example(models.Model):
    _name = 'module.example'

    blue = fields.Boolean('Blue')
    pink = fields.Boolean('Pink')
    yellow = fields.Boolean('Yellow')    

and in the xml:

    <record id="module_example_form" model="ir.ui.view">
        <field name="name">myquality list</field>
        <field name="model">myquality.myquality</field>
        <field name="arch" type="xml">
            <form>
                <group>
                    <field name="blue" attrs="{'invisible': [('pink','=',True),('yellow','=',True)]}"/>
                    <field name="pink" attrs="{'invisible': [('blue','=',True),('yellow','=',True)]}"/>
                    <field name="yellow" attrs="{'invisible': [('pink','=',True),('blue','=',True)]}"/>
                </group>
            </form>
        </field>
    </record>