A dye stealer is a term used to describe a positive pregnancy test where the test line appears darker than the control line. This happens when the level of the pregnancy hormone hCG is so high that the test line steals the dye from the control line, causing it to appear lighter. High hCG levels are an indicator of a progressing pregnancy, and hCG levels peak between 8 and 11 weeks. Therefore, a dye stealer is usually considered a good sign. It is important to note that a dye stealer pregnancy test is not a medical term and is not used by healthcare professionals. It is a term used by women who are trying to conceive or are pregnant to describe a positive pregnancy test result.