This activity explores an image of tattoo ink particles inside cells, which serves as a phenomenon for learning about the structure and color of human skin.

Tattoos are permanent designs made by inserting special pigments, such as tattoo inks, into a person’s skin. The image shows a section of human skin with a red tattoo, magnified under a microscope. Dark red particles of tattoo ink can be seen in the top center of the image. These particles are inside cells in the dermis, the layer of tissue beneath the outer layer of skin (epidermis).

The “Educator Materials” document includes background information and implementation suggestions for using the image as a phenomenon. The “Student Handout” includes the image and background information.

The “Resource Google Folder” link directs to a Google Drive folder of resource documents in the Google Docs format. Not all downloadable documents for the resource may be available in this format. The Google Drive folder is set as “View Only”; to save a copy of a document in this folder to your Google Drive, open that document, then select File → “Make a copy.” These documents can be copied, modified, and distributed online following the Terms of Use listed in the “Details” section below, including crediting BioInteractive.