In the Forgery Detection class, you only have to examine the three signatures to identify which one is fake.
The scream. it is on the top middle level next to the forgery detection lab.
Examine the painting in the package as you did when you scanned the paintings in Forgery Detection. There is a message written underneath.
Pass the assistant curator's test on painting styles. (see related question)
He is the darker-skinned fellow in the suit, who will test your painting knowledge and give you some training in Forgery detection.
In the forgery training, the one fake painting of the three was identified by the difference in the signature. In the Moonlight painting, stars are showing through the Moon.
The magnifying glass is only used in the Forgery Detection class on Counterfeit Island.
There is an online game called Poptropica, which has a Counterfeit Island. The word counterfeit means a fake or forgery.
In the forgery detection experiments, the fake painting of the three is the one with a different signature. You do not have to determine which one it is : just use the magnifying glass to examine the lower right corner of each painting.
you put the paintings in a rotational order going left. then, go to the guy up stairs and you go in to the forgery dectection lab.
You have to re do it. It is not that bad.
You have to swap the painting out to get the museum job. (Move each wrong painting clockwise into the next wing.) Then you take the Forgery Training to get a Supply Room key. (see related question)
Use the x-ray wand inside just as you did on the Forgery test: scan the painting and you see a message telling you to meet the curator at the Pop Art Museum on Early Poptropica. (You actually travel there in the blimp, but you should not play out that island until you complete the Counterfeit Island quest.)