Instant purchase is OK. This is a sample of fountain pen ink. I will fill the small bottle in the image with ink and ship it. I will use a 5ml bottle. I will wrap the lid with masking tape to prevent it from opening, and then wrap it in bubble wrap before shipping. If you purchase multiple sample inks, I will discount 100 yen per item! Please refrain from purchasing if you are looking for perfection or are very particular, as this is done by an amateur.