Pilot Iroshizuku Yama-Budo is one of the more popular Pilot colors, and for good reason. It has an amazing dry time, is very vibrant, and all-around performs very well. It's expensive, but worth it to many fountain pen fans. Whether it is or not for you will depend on what's important to you. Here's my review:
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Here are some colors similar to Yama-Budo:
What do you think about Yama-Budo? I'd love to hear your thoughts in the comments.