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While I was in Japan, I had the opportunity to visit Sekaido and Itoya, two huge art supply stores. While neither were the art supply wonderland I'd hoped they'd be, they were still fairly impressive, and I was able to pick up a fair amount of art supplies on the cheap. I took advantage of this opportunity to procure an assortment of tech pens to test for the blog. I don't know how many of these are commonly available in the US, but hopefully this will alleviate a little of the supply envy many Westerners have in regards to Japanese art supply.
Pens will be displayed in order that they are tested on the paper below. I used what I normally ink on- Strathmore 400 series plate Bristol.
The area boxed in faint blue is where I tried to erase the ink vigorously using a Tombow Mono Zero eraser. The blue/green area is Copic marker, and the boxed graphite area on the arm tests water solubility.