It showed up after the allotted time period. Evaporation Lines: Always read your test results within the test reaction time (usually 5 minutes) as evaporation lines can develop as the urine dries on the test area. To start-with, no evaporation line will be coloured (pink or blue etc. depending on the test you used). Are evap lines thick or thin? So if the line is coloured – no matter how faint the line is – then HCG made the line change colour – nothing else! The question here is, what are the chances of an evaporation line. A lot of people told me that the line can only turn blue from hcg and if it were an evap line it would be thinner and more gray. Only the HCG can combine with the pregnancy-assay molecules and bring about a colour-change. Can an evaporation line be thick and blue? The test line is light, light blue and very thin. So I just left the bathroom ( with the test still on the counter, and went on about the day, no biggie, figured it was a bit to early anyways ) I went back into the bathroom a few hours later, not to even look at the test, but then seen a VERY dark ( as fark as the control line ) line but its not as thick as the control line, its thin … The control line was good and solid, before the 10 minute window was up, a very very faint line appeared in the results window. Just wondering I took the one with the blue dye but my line was pretty thick it's just hard too see. Upload your photos, zoom in and use our photo tweaking tools! The evap lines are usually really thin, and can be bright blue. So this is my irritating dilemma. Equate pregnancy test evap lines? The evaporation line is a line that may show up on the test after an extended amount of time. Wondering if your test is positive or negative? An evaporation line develops when the urine on the test area begins to dry, leaving a faint, colorless line. I have read a ton of people saying that evap lines are faint, thin, and mostly gray in color. This evaporation line begins to show up once the urine has started to evaporate and reacts with the test strip. These are lines that shows in the result window of the test. Evaporation lines are caused by evaporation of the urine in the result window of a pregnancy test. Not thick at all. depending on the test you used). My test that I used water on, actually now has a big blue like but the top of the line kinda curves in. I would retest in a couple of days. So one would think pregnant right? If it was negative in the first ten minutes, then I would say it's negative. Post photos of your pregnancy tests and ovulation tests (OPKs) for the community to vote on. An evaporation line, also commonly known as an "evap line," is a term that describes any test line that appears after the time limit is up on a pregnancy test. Only the HCG can combine with the pregnancy-assay molecules and bring about a colour-change. (invert, greyscale, brightness, contrast, saturation and hue). zgj-- Sounds like an evap line. Sometimes the evaporation line can mimic a positive result by causing a faint line to appear. I mean a line is a line right? I have taken 3 of the equate blue dye ( l l ) not ( + - ) test. However the line did show up within a minute or so of taking the test. To start-with, no evaporation line will be coloured (pink or blue etc. My cycles are kind of irregular but tend to be about 35 days long. It was the + or - one.… I have unfortunately experienced more than my fair share of evaporation lines in my ttc journey, some I could spot, others were more tricky. My period may be 6 days late if it was 35 days long this month. Evaporation lines appear to show up (or not show up) as a result of the composition of the particular urine specimen – and they may appear on any test regardless of brand. So if the line is coloured – no matter how faint the line is – then HCG made the line change colour – nothing else! I didn't look at it again until over 10 minutes (the max time) later. Filtered: Evaporation line. I took an equate pee test yesterday, and after two minutes it appeared negative. Al three have given me a very faint positive.