Blue Dye vs Red Dye pregnancy tests

Any one get different results with a red dye test vs a blue dye? I took a blue dye test 13 DPO and it was negative. I was talking to a friend about it and she said that she had a negative test at 14 DPO with a blue dye test and took a red dye test the same day and it was positive. I’ve honestly never even heard of the difference but want to hear others experience.