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With mouth wide open, vibrating air coming up the throat from the vocal chords leaving the open mouth and spreading in all directions. Hi, I am Janice VanCleave, author of 50+ best-selling science experiment books for children ages 4 through high school. I taught science for 27 years and now am creating this science website.   My scream was not staged. The picture was to be of two adult cats, which I was holding. A microsecond before the camera snapped, the two cats dug their claws into my skin as they prepared to leap out of my arms. A picture like this is great for making inferences. Kids could make "guesses" as to why I am screaming. They would be drawing on facts from the photo, such as I look like I am in pain or maybe I am just pretending.

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Home » Chemistry: Stain Removal

Chemistry: Stain Removal

By Janice VanCleave

weavingNotes from Janice’s Desk

I love blackberries but seem to always drop them on my clothes. Actually, I am worse than a small child when it comes to staining my clothes with the foods I eat.This means that I have lots of clothes that have food stains on them.

While researching food stains I discovered that dyes are attracted to the chemicals in the material they come in contact with and stain. Sometimes the dye actually combines with the chemicals and you can forget about removing the stain. But, some dyes just weave in and out of the fibers that make up the fabric. This is much like the colored strings the child in the photo is weaving over and under the fibers on the cardboard. I’ve added arrows to point to one of the strings. If this string were cut in several places, it could easily be removed. The same thing can be done with some dyes when you wash your clothes with detergents containing enzymes.
food-nutrition
It is a bit more involved than just snipping the dye particles so they can be washed out, but it is not difficult to understand. In fact, getting stains out of cloth with enzymes is basically the same process as making meat tender with a tenderizing chemical. For information about this process as well as an activity you can do yourself, see

This happens when you wash your clothes with detergents containing enzymes. That decompose chemicals in the stain. Now that is a really smart enzyme to pick out only the dye and not the fibers in my clothes.

For more information about enzymes, see BIOCHEMISTRY: ENZYMES

More Later,

Janice

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Filed Under: Biology, Chemistry

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The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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