I ordered a bottle of Apache Sunset on Amazon and my FPR Guru is arriving soon. I only have two bottles of ink, Parker Quink Black ink and Pelikan 4001 Royal Blue. I saw people using inks that resemble the 4001 Royal blue greatly to flex. That's when I thought, perhaps there is no need to buy another bottle of ink for my flex nib while I'm waiting for my Apache Sunset. I have zero experience with flex pen inks, so please tell me whether the 4001 is suitable for flex pens, if not, are there any cheap alternatives?
Cheers,
Ian