Colour-transforming ink can be found within the obverse side with the bill in two various destinations- on the liberty bell and about the numeral "a hundred" located within the decreased suitable corner. On top of that, a watermark of Jackson can also be observed from each side in the light. https://martinjjhhg.onesmablog.com/the-smart-trick-of-how-to-tell-a-dollar-is-fake-that-nobody-is-discussing-73749162