I used image occlusion to create these flashcards which you can use to help learn the colours of the inorganic ions and transition metal complexes as well as what was used to create them if needed and their formula and charge. I hope you find these as useful as I have been finding them so far. :) The image used was from the official OCR website and I have attached the link below. https://www.ocr.org.uk/Images/598991-colours-of-inorganic-ions-and-complexes-poster-.pdf This image is free and for public use. I am not claiming these images to be my own work.