4 Open for Discussion: Are Artificial Dyes Bad for You?
By Brian Rohrig
Many people have concerns about the safety of food dyes.
Vol. 33, No. 3
Are these concerns supported by scienti;c evidence?
19 As a Matter of Fact
The Chemistry of the Colors of Autumn Leaves
5 Eating with Your Eyes: The Chemistry of Food Colorings
By Brian Rohrig
Open for Discussion:
Dyes Bad for
You? p. 4
A large amount of the foods we eat contains food colorings.
We tell you where they come from, how they work, and
the difference between natural and arti;cial food colorings.
8 Tooth Decay: A Delicate Balance
By David Warm;ash
When a tooth decay occurs, some of the white, outer layer of
the tooth, or enamel, starts to dissolve. Learn more about this
process and how chemical solutions in our mouths, called
buffers, help to prevent tooth decay.
11 Probiotics: Good Bacteria, Good Health
By Gail Kay Haines
Bacteria are not all bad. Some of them are essential to human
digestion, provide energy, and back up the immune system.
Learn about the foods and beverages that contain these bacteria
and how they can help improve your health.
COVER S TORY:
Eating with Your Eyes: The Chemistry of Food Colorings
As a Matter of Fact:
The Color of
14 Dirt? Who Needs It? How Hydroponics Is Poised
to Change the World
By Mallory Pickett
DR. EDITH WIDDER, ORCA; SHUTTERSTOCK; THINKS TOCK; AN THONY FERNANDEZ
The amount of land suitable for agriculture, and the stores of
water needed to grow crops are shrinking. So, how will people
feed themselves in the future? Hydroponics, a type of agriculture that does not use soil, may provide a solution.
16 Light in the Cellar of the Sea
By Linda Zajac
The deep sea is a place of bone-chilling water and near-total
darkness. Yet, marine organisms emit light to either ;nd food
or attract prey. Little is known about them, but marine scientists
are slowly revealing many of their secrets.
for each issue at:
More On The Web!
Find your complete
Teacher’s Guide, videos,and
On the cover: Photo by Michael Ciesielski Photgraphy
Subscribe to online at:
www.acs.org/chemmatters or 1-800-333-9511