More catching up: There's a recently started exhibition at the Haus der Seidenkultur Krefeld, titled "Purpurschnecke und Färberwaid". It is about the development of textile dyeing and colourings, and it will remain open until 28.02.2021.
You can read more about the exhibition in German here, and English information is available here. And if you want, you can even watch the video recording of the (mostly digital) opening!