Stubborn Stains (page 2)

 Experimental Procedure

1. Start by making a hypothesis. Which stain will be removed fastest?
2. Use scissors to cut 12 pieces of each fabric. Each piece should be at least a 1- by 1-inch square. 

3. Take one piece of white t-shirt fabric. Using the pencil, draw a one-inch line on the fabric.

4. Time for exactly one minute after stain has been applied before continuing.
5. Press down twice on stain with the tip of the Tide to Go (stain remover) stick.
6. Rub rag on stain while timing. Make sure to use the same rhythm and force for every trial. Rub for up to 150 seconds.
7. Stop timer when stain is completely removed, or when 150 seconds has elapsed.
8. Record the time it took on your chart. If stain was not completely removed after 150 seconds, note this information along with your observations on how the stain did change.
9. Repeat #s 2-8 with the other two fabrics (towel and jeans).
10. Take one piece of white t-shirt fabric. Using the blue pen, draw a one-inch line on the fabric.

11. Repeat steps 4-9.
12. Take one piece of white t-shirt fabric and spoon 1/4 teaspoon of tomato sauce onto it. Rub in.

13. Repeat steps 4-9.
14. Take one piece of white t-shirt fabric and pour two drops of soy sauce onto it. Rub in.

15. Repeat steps 4-9.
16. Repeat steps 3 through 15 two more times. Now you will have completed three trials.
17. You have now finished gathering your data. Look at your data and figure out which stains were removed the fastest in each trial.
18. Clean up.

Chart: Trial (1/2/3)

          Fill in each cell with the time in seconds, and any observations.

Bibliography

"Tide To Go Instant Stain Remover."  Copyright 2009, Procter and Gamble.