Chemistry: What's Hot Now: Bleeding Knife Chemistry Trick

Chemistry: What's Hot Now These articles that had the largest increase in popularity over the last week

Bleeding Knife Chemistry Trick Aug 10th 2011, 10:02 Here's a cool chemistry trick, perfect for Halloween! Trace a knife over your skin and leave a message that appears to be written in blood. The project works equally well with a spoon, but somehow loses impact. Try it... Bleeding Knife Materials dull knife (we don't need real blood here) 5 grams ferric chloride 5 grams potassium thiocyanate water Prepare the "Magic" Solutions Prepare saturated solutions. Mix a few milliliters of water with the ferric chloride to dissolve it. Separately, mix a few milliliters of water with the potassium thiocyanate to dissolve it. Perform the Trick Dip the knife blade in the ferric chloride solution. Coat the area of skin to be "bloodied" or written on with the potassium thiocyanate solution. Draw on your skin with the dampened knife blade. A deep red liquid resembling blood will appear where the two solutions mix. How It Works This chemistry trick is one form of a sensitive test for the ferric ion. A red color is produced by the reaction between the ferric ion and the thiocyanate ion. Bleeding Knife Clean-Up and Safety When you're done, rinse the blade and your skin under running water to remove the chemicals. The demonstration is safe to perform, but restrict the project to your arm or hand and avoid eyes, nose or mouth to avoid ingestion of the chemicals or irritation of mucous membranes. Halloween Chemistry Glow in the Dark Jack-o-Lantern Ectoplasm Slime Science Halloween Costumes More Halloween Fun Fake Blood for Kids Halloween Pictures and Fonts Halloween Crafts

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