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Make: Online guest author Tito Jankowski found these gel electrophoresis cookies from last year on Not So Humble Pie.

Using your purple icing, pipe a square outline on each of the cookies and allowed it to set. Given the consistency of your icing should take at least 10 minutes, probably longer. Then thin the remaining purple icing with a little bit of water and flood each of the squares. Before the purple icing has set, use the pink icing to pipe in the little lines to create the markers.

Allow the cookies to dry overnight.

Becky Stern

Becky Stern

Becky Stern (sternlab.org is a DIY guru and director of wearable electronics at Adafruit. She publishes a new project video every week and hosts a live show on YouTube. Formerly Becky was Senior Video Producer for MAKE. Becky lives in Brooklyn, NY and belongs to art groups Free Art & Technology (“release early, often, and with rap music”) and Madagascar Institute (“fear is never boring”).