|MadSci Network: Chemistry|
Kameron, As a Senior Scientist who works for Crayola, I have formulated marker inks for years. You have chosen to do an excellent experiment. You also have the right scientific method by using a control. As for the treatments, you can either soak the shirts in the respective solutions or pretreat them with the solutions and put them all in the laundry. Be forewarned, you must find a way to mark each shirt as consistently as possible (and realize that you may need more than one of the same color and brand of marker because coloring on fabric is hard on the marker tip and may damage it readily. Consistency is obviously important here since more ink on one shirt versus another may skew the results of your study. As for the evaluation, unfortunately, you do not have access to a spectrophotometer, which is what we use to measure color values of stains. You will need to rely on a visual assessment (by eye) to ascertain if one solution was more effective than another. Dr. Crayola
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