mare-tem4

Broad Question
How permanent are permanent markers?

Specific Question
What soap best removes black Sharpie from a white t-shirt?

Independent Variable:
Soap type

Dependent Variable:
Fade of Sharpie

Variables That Need To Be Controlled:
The Sharpie, the shirt, and the stain.

Hypothesis
I think the dish soap will best remove the Sharpie stain from the t-shirt.

Experimental Design
I will investigate which type of soap best removes black sharpie from a white t-shirt. I will conduct my experiment at my house because it is the easiest place to find a time. I am the only person involved in my experiment. I will perform the experiment, take the data, and observe what happens. I will need two trials to have enough information for a reliable conclusion. When I am conducting my experiment I will be entering the data straight into the computer. To document the process I will take pictures of every trial.

Materials List
A white t-shirt A black fine point Sharpie marker A bar of soap A bottle of hand soap A bottle of dish soap A bottle of laundry soap A bowl of water A sponge

Detailed Procedure

 * 1) Gather all materials
 * 2) Draw five lines of equal size and length with the Sharpie on the t-shirt
 * 3) Apply bar soap on one line on the t-shirt for a total of 10 rubs
 * 4) Apply one squirt of hand soap on a different line and rub 10 times
 * 5) Apply one squirt of dish soap on another line and rub 10 times
 * 6) Apply one cap full of laundry soap on the a line (leaving one as the control) and rub 10 times
 * 7) Take a sponge full of water from the bowl and rinse out all the soap on the t-shirt
 * 8) Put the t-shirt in the dryer and take out when dry
 * 9) Compare the fade of the Sharpie lines
 * 10) Record data
 * 11) Repeat steps one through ten for one more trial