A quick glance does not show every clue on a bill. The current-design US twenty-dollar note has features you can observe in different ways. This description belongs to that design, not every kind of money.

A watermark is a faint image within the paper. When an adult holds the note to light, look for a faint portrait in the blank space beside the main portrait. An embedded security thread is another light-visible clue. Embedded means set inside.

Tilting the note changes the corner number twenty from copper to green. Its printing is raised, so touch gives another kind of clue. Let the parent keep hold of the note while you observe.

Record what you actually notice. A clue may be difficult to see under your lamp. Seeing these features helps you describe the note; this home activity cannot certify whether it is genuine. Genuine means real. No copying, special equipment or suspected-money test is needed.

Your folded card hid a mark until you opened it. That was an original paper puzzle. It was not a watermark, an embedded thread or a copy of a real security feature.

Security features give people several ways to examine currency. A printed picture alone does not do the same job as a feature within the paper or a color change seen on tilting. Different observations can provide different clues.

The material matters too. US currency paper is made from cotton and linen. An ordinary sheet may feel different. But feeling something different does not prove that a particular note is genuine or fake.

Think back to your first guess. Did one new clue settle everything, or give you something further to notice? A careful report says "I saw this when the parent changed the light." It does not say "I have proved this money is real." Keep your own clue cards clearly fictional and leave real notes intact.

together · About 5 minutes; estimate

You need

• Paper and pencil
• Household lamp
• Adult-held current-design US $20, if available

Try it

1. Choose a real note held by an adult or an original folded paper clue card.
2. Record what you can notice at first. Do not copy the note’s design.
3. Ask the adult to change the light; record any new clue.
4. For a note, ask the adult to tilt it and guide a gentle feel. For a card, unfold it.
5. Write which action revealed each clue.
6. Mark anything unclear as not seen clearly. Give no genuine-or-fake verdict.