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The structures were grown in a saline solution, and were composed of tannic acid and copper phosphate.—Ben Coxworth, New Atlas, 8 Feb. 2025 These are sweeter due to lower tannin (tannic acid) percentages.—Josh Honeycutt, Outdoor Life, 12 Sep. 2024 Reports of stained or tea-colored water in the area have also come in, the news release said, which is likely happening because tannic acids — a byproduct of decomposing vegetation — are being released from flooded wetlands.—Madeline Heim, Journal Sentinel, 19 July 2024 By mixing iron sulfate with tannic acid (which Little derives from cooking the plant sumac), the ink gets its deep shade, which darkens on the paper’s surface once exposed to oxygen.—Jacqui Palumbo, CNN, 28 Mar. 2024 Redwoods, a notable exception, are considered fire-resistant due to the tannic acid in their bark.—Jessica Damiano, San Diego Union-Tribune, 26 Aug. 2023 The bark of these trees contains tannic acid, which helps their bark stay safe from flames.—Li Cohen, CBS News, 22 Aug. 2023 Ground gall nuts, taken from an oak-like tree, were boiled to draw out tannic acid, which was mixed with iron sulfate scraped from nails.—Joe Pappalardo, Popular Mechanics, 3 July 2020 Add a pinch of baking soda to neutralize the tannic acid in the brew.—Jenny Comita, Better Homes & Gardens, 16 Apr. 2021
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