They are such lovely inks and don't stain your stamp! I was looking to purchase these for a while now and they did not disappoint. All 4 colours complement each other pefectly especially on layer stamp sets, like the Sunlit Flowers stamp set that I had received, a few weeks earlier with alcohol markers, so when these inks arrived then I learned how to layer colours with the stamps.
From testing them out (pic attached) I'd say that my absolute favourite colour is Ultraviolet, I love using Andromeda as an outline ink - like how you would use a black ink. The Hydrangea and Wisteria are perfect for layering colours as they are lighter shades. Thank you, thank you, thank you Altenew for creating these!