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Microscopic Blood Slime

Microscopic Blood Slime

What does blood look like under a microscope? Try out this fun slime-making activity to see for yourself!

Time Needed:
15 - 30 minutes
2nd Grade, 5th Grade
Life Science, STEM Entertainment
Educator Rating:
Parent Rating:

What I'll Learn

When we bleed, it looks bright red. But blood is actually made up of liquid plasma (clear-yellowish color), lots of tiny platelets, large red blood cells, and even larger white blood cells.

What to Do

What I Need

What to Do: Step-by-Step Instructions


In a small bowl or zipper lock sandwich bag, mix 1/4 cup warm water with 1/2 teaspoon baking soda until it is fully dissolved. Set aside.

Tips & Tricks:

The water doesn’t have to be hot. Warmer water helps baking soda dissolve quickly.

In a separate bowl or plastic bag, add five ounces of clear school PVA glue and 1/2 teaspoon of red glitter.

Tips & Tricks:

A standard bottle of school glue is 5 ounces.

Fun Fact:

The clear glue represents the plasma in your blood. The glitter represents the platelets. In real life, plasma is yellowish in color and platelets are colorless.

Add the baking soda solution into the bowl or bag with the glue and glitter, keeping the bag unzipped. Mix thoroughly with a spoon or by squishing the outside of the bag with your hands. Be careful not to spill!

Tips & Tricks:

If the bag is zipped shut, mixing the slime may force the bag to pop.

Gradually add in 4 1/2 teaspoons contact solution while continuing to mix. Mix until the slime is a nice slime-like consistency.

Add in the small white balls (beads, tips of cottons swabs, pompoms, etc.) and the small red balls (beads, sprinkles, etc.).

Fun Fact:

The white balls represent the white blood cells and the red balls represent the red blood cells.

The slime may have lots of bubbles causing it to look “cloudy”. It may take several days until the bubbles work their way out, leaving your slime or “blood plasma” nice and clear.
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