Pink vs blue dye

B • one girl || 10.14.2016 #2 expected late may 2020 ✨

What’s the deal/difference when people talk about blue vs pink dye in pregnancy tests? I’ve been using cheap HCG strip tests from amazon with red/pink dye, but want to get a drug store one to be sure in a few days. Is there a true difference or is it just a cost thing? Or what kind is better? I don’t remember what brand I used with my first pregnancy.