What would be the most likely explanation if none of the tested paint samples had turned brown? O

The reaction was not actually caused by UV light.

o

The reaction only happens in real sunlight, not artificial.

о

The paint behaves differently on a canvas than it does in a laboratory

O

None of the tested mixtures matched the chemical composition of Van Gogh's paint.

The correct answer is D) None of the tested mixtures matched the chemical composition of Van Gogh's paint.

Explanation:

Recall that they had to reverse engineer the exact type of Chrome-Yellow which was used by Van Gogh. They had come up with and tested various samples which had been mixed accurately with UltraViolet Radiation until one of the samples exhibited the same reaction of 'browning' as on the painting.

Once they were past this stage, they checked to see that the chemical reaction on the painting turning the Chrome Yellow to brown was the same as that which had been artificially degenerated or aged.

The submission was that until they could come up with a way of protecting the paints from such a hazard, they had to be kept from UV radiation.

Cheers!