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Overall, only 2.1% of the pine trees' rings and 1.3% of the juniper shrubs' rings were blue; the cells which hadn't lignified properly were mainly found at the end of growth rings, in latewood ...

Scientists have discovered that peculiar "blue rings" in wood samples reveal the aftermath of chilling volcanic eruptions that disrupted growing seasons over a century ago. When summers turn ...

These “blue rings,” visible only under a microscope, reveal centuries-old stories of climate disasters that once brought summer temperatures plunging to near-freezing. The study, published in ...

In Norway, scientists have found blue rings in trees that hint at how volcanic eruptions disrupted growth throughout history. Credits: Credits: Havardtl, CC BY 4.0, via Wikimedia Commons. Scientists ...

A blue ring formed in 1902 in a tree in northern Norway. Image by Pawel Matulewski and Liliana Siekacz. Scientists studying pine trees and juniper shrubs in northern Scandinavia are revealing the ...