models suffix

hello
i try to change the suffix of the models and i did try almost every one of them color1, DARK COLOR1, BORDER COLOR1 and nothing change .

i did try capital letters, small letters, with quotation marks and without, just nothing change
can you please tell me what should i do ???

thank you

Did you use a space before the suffix name, like ' dark' (NO 'dark') ?

yes i did use space " color1" not without space "color1"

what else should i do

Without checking your site it is hard to help you, please give site URL and module name where you use this suffix.