Do evap lines have color?

Fall • Mama of two 💖💙
I have been testing since 9 dpo and first got a colorless line on a frer but negative since then. My period is due today and used a Walmart cheapie and got bfn at first but went back and saw a bright line. It has color but since it was technically past the time frame it is irrelevant right? 
Never had this happen before