How to read a bKGD chunk?

[banzalik]

How to read a chunk bKGD?

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identify -verbose new.png 

If bKGD chunk does not exist, then wrote:

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Background color: white

If there bKGD chunk (any color value), then wrote:

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Background color: rgba(0,0,0,1)

How to find the correct value bKGD chunk, using ImageMagick?