Evaporation Line vs Faint Positive: How to Tell the Difference
Timing and line color matter most. Learn the simplest way to separate a faint positive from an evap line.
Why evaporation lines cause so much confusion
As a test dries, faint evaporation artifacts can appear where the test line would be—especially if you look long after the recommended read time. That's why manufacturers emphasize reading results in the instructed window.
The two signals that matter most
1) Timing: did the line appear within the stated read window? 2) Color: is it clearly the same dye color family as the control line, or is it gray/colorless? If timing and color don't align, treat the result as uncertain.
Photo-enhancement: helpful, but not a verdict
Filters can help you see what's there, but they can also amplify shadows. Use enhancements to compare consistently (same lighting, same angle), not to 'force' a positive.
What to do if you're stuck in the gray zone
Retest using first-morning urine if you're testing early, and consider a second brand (pink dye vs blue dye) if you repeatedly see ambiguous results.
How to use an AI checker responsibly
Use your AI photo checker to clarify visibility and track progression over time—but always treat it as informational, not diagnostic, and confirm with a healthcare professional when needed.
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