Treasure maps and concentrations

Have you ever made paper look older by soaking it in tea? We used the same idea to learn about concentrations and made treasure maps at the same time, which were great for starting to learn about directions.

You could also use the opportunity to think about good experimental practice, what variables you have and which conditions you need to keep constant.

What you need:

Paper

Hot water – be very careful and ask an adult to help

A Tray

Pens

Tea bags

Measuring jug

What to keep constant

Amount of water – jug used

Size of tray

Time tea bag is left in the water/or number of tea bags

Size of paper

Time paper is left in the water

What to change

Number of tea bags or time the tea bag is left in the water

Make sure you only have one condition you change, everything else should be constant

Method

• Measure out a quantity of water in a measuring jug that will fit into your tray nicely. Add one tea bag and leave for a set amount of time, we waited 10 minutes, which also allowed the water to cool down.

• Remove the tea bag and carefully pour the water into your tray.

• Add one piece of paper, making sure it’s fully submerged.

• Leave for a set amount of time, again we waited 5 minutes, carefully remove the paper and place in an oven on low heat to dry.

• Repeat the same process but this time change one factor, you could use 2 tea bags for the same amount of time as you used one, or leave one tea bag for longer, or even leave the paper soaking for longer.

• Once dry compare the colours of the two pieces of paper, are they different?

Once our maps were dry, we had a go at drawing maps for each other to follow, this was great for starting to think about where places are in relation to each other and thing about general directions.

Results

We found the map left in the stronger tea solution was noticeably darker than the weaker solution, which is what we expected. The stronger solution of tea coloured the paper more than the weaker solution.