what color is an evaporation line?

Question

can it be the same color of the dye? if you briefly seen a light line but didn't pay much attention because you thought it had to be darker but looked at it later and definatly seen a blue line is this a postive?

Answer 1

What's an evaporation line? Evaporation ("evap") lines result with the test's antibody strip just looks slightly different than the space around it. There is a line of antibodies (usually made from mouse cells) in the Control and Test section. The Control line binds with any liquid and turns pink (or blue, in tests using blue dye.) The Test/Result line turns pink only if pregnancy hormone is detected. If not, the moisture passes over this strip and does not turn pink. It may, however, become more visible when the light hits the moisture on the strip-- it may appear gray, colorless, like a "dent" in the test, or like a "ghost line." It may appear at any time-- as soon as the urine hits it, after a few minutes as the test absorbs the moisture, or after the 10-minute time limit. It may appear when the test is drying, or after it has dried. It may disappear as the test is drying, or after the test has dried, or not disappear at all.

The simple fact is that there is always "something there" that is slightly visible-- it's simply the antibodies on the test that would turn pink in the presence of hCG. When the test becomes wet, or as it dries, or after it dries, the antibody strip may become more visible. Therefore, all tests may have them. It is not a defect; it's just how tests are made.

A real positive is identified by its color (pink or blue, whatever the color of the test's dye is) and its appearance within 10 minutes of urinating on the stick. A line that appears after 10 minutes, regardless of color, must be considered an evap line and is caused by the test's chemicals changing. HPT's are rapid assay diagnostics, which means any results appearing after the "rapid" time limit of 10 minutes are invalid.

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Answer 2

The directions for most pregnancy tests clearly indicate that ANY line in the positive window, faint or dark, is usually a positive indicator of pregnancy. Try taking another test, and see what that says. Don't rely on the color of the line: just look for a line! :) If you are still unsure, visit your doctor or a clinic for a blood test. Take care :D

Answer 3

usually evap lines are grayish color. but mine had pink tips on each end. you cannot judge that it was postive if it was looked at after the 10 minuet marker. also evap lines almost always disapear the next day, if you still have a line tommarow than i would test again using first morning urine.

Answer 4

Evap lines are often white or gray in colour and ensue after the ten minute or so shrink. in view that your line is the comparable colour because of the fact the attempt, i might retest in approximately 3 days and notice what happens then. This time attempt to in basic terms look at it interior the timeframe. good success!

Answer 5

Evap lines are usually gray or white...If you think you had a positive test then I suggest to retest with first morning urine because it is the most concentrated....dont read the test after 10 mins....Good Luck!