On 09/27/2019 02:16 PM, wrote:
"One of those chemicals, known as photoresist, is critical for top-of-the-line products produced by Samsung Electronics, the giant South Korean maker of chips and gadgets, among others. Japan controls around 90 percent of the world's supply."

Japan and South Korea Feud, but Breaking Up Is Hard
New York Times - August 28, 2019
-- https://www.nytimes.com/2019/08/28/b...rea-trade.html

supposedly also HF(acid). arirang TV has been reporting on it..