Fake! Activity 3: The Painting? Year 7 Upgrade A teaching sequence from the Forensics unit of upd8 wikid Year 7 Upgrade 1

7E Learning Cycle 2 Was the painting swapped for a worthless fake? Students give ideas as to how they could find this out Students explain their results and how they used chromatography Students use chromatography to compare paints from a real old painting and the possible fake Students explore using chromatography to separate the pigments in black ink Students learn about how chromatography works and check their understanding 2 © Association for Science Education and Centre for Science Education 2010 This page may have been changed from the original 2

Expected Learning: Use chromatography to separate the substances in a mixture. Explain how evidence from chromatography can be helpful to forensic scientists. Activity 3: The Painting? 3

I need to check your progress. What do these important words mean? Engage Elicit Explore Explain Elaborate Extend Evaluate I need to check your progress. What do these important words mean? Particle Mixture Evidence 4 Activity 3: The Painting?

But we still don’t know why. Engage Elicit Explore Explain Elaborate Extend Evaluate So Billie, we have evidence to prove that the painting was handled by an unknown person. But we still don’t know why. Hmmm…what if the person who broke in swapped the painting for a worthless fake? 5 Activity 3: The Painting?

Engage Elicit Explore Explain Elaborate Extend Evaluate Great theory! Let’s ask the gallery owner if the painting looks like a fake. I don’t think it will be that simple. We’ll need some evidence that it’s not the original painting. Let’s ask Dr Sherl for some advice. Reduced word count 6 Activity 3: The Painting?

Figure out how to solve this problem, and find out how it works. Engage Elicit Explore Explain Elaborate Extend Evaluate You’re right Billie. If we are going to present this theory in court we will need scientific evidence. Forensic scientists use many different techniques to analyse evidence to help solve crimes. Figure out how to solve this problem, and find out how it works. 7 Activity 3: The Painting?

Most paints contain a mixture of different pigments. Engage Elicit Explore Explain Elaborate Extend Evaluate SS1 Most paints contain a mixture of different pigments. Pigments are made up of particles. Black paint is made up of many different pigments. Pigments are coloured substances. Different colour pigments contain different types of particles. Modern paints and old paints contain totally different pigments. Most modern paints are made from synthetic (man-made) chemicals. Old paints were made from natural substances. We can see the different pigments in a paint by separating them. The real painting is from the 17th century. A fake would be modern.  8 Activity 3: The Painting?

Engage Elicit Explore Explain Elaborate Extend Evaluate Now you need to separate out the paint pigments from a real old painting and do the same for the painting you think is a fake. Use chromatography. I’ve taken scrapings of paint from the real old painting (A) and the one we think is fake (B). I made the scrapings into a solution. I dabbed the solutions onto filter paper. It’s up to you to do the rest! Hazard - possible flammable vapours or materials 9 Activity 3: The Painting? This page may have been changed from the original This page may have been changed from the original

Activity 3: The Painting? Engage Elicit Explore Explain Elaborate Extend Evaluate SS2/3 10 Activity 3: The Painting?

I’ve carried out chromatography on both paints… Engage Elicit Explore Explain Elaborate Extend Evaluate SS4 I’ve carried out chromatography on both paints… The gallery owner will be very interested in the results. Great – so you see how chromatography is useful to forensic scientists! Write a report to the gallery owner explaining what you have found out. Tell him how chromatography works, so he understands our results.  11 Activity 3: The Painting?

Argh – all this investigating with inks has messed my notes up. Engage Elicit Explore Explain Elaborate Extend Evaluate SS5 Argh – all this investigating with inks has messed my notes up. I need your help to fill in the smudged words. 12 Activity 3: The Painting?

Activity 3: The Painting? Engage Elicit Explore Explain Elaborate Extend Evaluate 13a Activity 3: The Painting?

Activity 3: The Painting? Engage Elicit Explore Explain Elaborate Extend Evaluate Optional differentiated plenary task - we have left some of the letters to the missing words visible. 13b Activity 3: The Painting?

Picture credits Picture Slide Credit Activity from the Forensics unit © Association for Science Education and Centre for Science Education 2010. Teachers and others who download this material may use it freely within their institution. For any other usage consult the upd8 team, upd8@ase.org.uk ASE and upd8 are not responsible for any revision that may be made to the material after it has been downloaded.