I'm not sure about A level but large diameter filter paper works well (240-270mm can be cut up into strips suitable for 500ml beakers easily)Would grade 322 qualitative filter paper be suffice?
It is for an A level practical on leaf pigments
Same here. The results are much clearer. Worth the expense if you have the budget.Its probably not what you want to hear, but for A-level (grass) chromatography we just use TLC plates now as we get much better results and the students can read off meaningful rf values. They are pretty eyewateringly expensive, but you might find and old pack kicking around in the back of a cupboard, or if you have to buy them they can be cut down small to fit in a specimen bottle which makes them more economical.