Creepy density

Welcome to our Halloween density experiment.

What do you think?

What you need

Golden Syrup
Food colouring
Vegetable Oil
Small items to test for floating


Pour each liquid into the glass slowly starting with the treacle, then the golden syrup, followed by the water with added food colouring and finally the vegetable oil.

Drop a few small items in and see which layer they float on.

You can see below that we have a plastic bug floating on the top, a LEGO brick floating on the water and a paper clip floating on the treacle. Why do they do this?

The science bit!

For a full explanation see last week’s post.

We’d love to see your creepy or even very pretty density creations.


Don’t forget to check out our other fun science activities for children.

There are 21 comments

    1. mejaka

      Thanks, Donna! I assume corn syrup can sub for the golden, since that isn’t readily available in the states either. (My favorite granola recipe calls for Lyle’s and I’ve been wondering if it’s worth ordering…currently I sub honey.)

  1. Kendra

    I know this sounds stupid, but I just want to make sure that I understand correctly. The molasses won’t mix with the corn syrup? Even if a child shakes it?

  2. Halloween lesson plans - The Organized Homeschooler

    […] There are so many amazing science Halloween lesson plans ideas floating around Pinterest that it is hard to choose just one.  Luckily, you don’t have to!  I am going to set up a few science centers for us to explore.  Halloween screams candy so we will experiment to see which liquid dissolves candy first.  While that is dissolving, we will create a ghost pumpkin eruption using one of our jack-o-lanterns. My kids love anything that explodes or erupts.  We will end our science portion of the school day with a creepy density experiment. […]

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