Pilot Iroshizuku Yu-Yake fountain pen ink is an orange ink inspired by sunset.
This ink has a good contrast against paper. There's a very attractive sheen, a gradation of colour, to the strokes, that is indeed as beautiful as the sunset. It's one of my favourite coloured ink because of that quality. Every letter written seems to have its own personality. The colour feels very energetic, warm and inviting. It always makes me feel like eating an orange looking at the colours.
For writing and drawing purposes, this ink performs well.
Below are direct links to the ink on Amazon.