Such a shame that Hokusai didn't get a chance to read Sarah Renae Clark's excellent investigation [1] into lightfastness (coincidentally linked yesterday). [1]

Such a shame that Hokusai didn't get a chance to read Sarah Renae Clark's excellent investigation [1] into lightfastness (coincidentally linked yesterday). [1] https://sarahrenaeclark.com/lightfast-testing-pencils/ https://sarahrenaeclark.com/lightfast-testing-pencils/