I've had coloured evaps from CB loads, I fucking detest the brand and reguse to use them now, sorry hun x
Clearblue aren't worth the money! Just get a pack of cheap red dye tests from Amazon (easy@home seem to be the most popular, I've been using vondfo and they are good too) or FRER if you feel like splurging ;)
If you read the results after the recommended time, then it’s not an evap line. It’s an invalid line.
Unfortunately clear blue are known for this ☹️ I just don’t even buy them anymore I just stick to red dyes, I had 5 “positive” from clear blue and was in fact not pregnant