Grade I think is the entry level, the reason for this, if you look at the gouletpens individual ink selling price explains the problem.

In order to save costs and not regularly change the raw materials lead to a color different batches of color difference is very large, because of the injury pen by the United States vintage pen circle basically black, sparing no effort to output their own radical views on certain aspects of the triggered the netizens to revolt. Of course itself has its own batch of die-hard fans, and goulet cooperation marketing windy.

Introduction

Ink is a liquid containing a pigment or dye, ink is used for writing or drawing. Some of the earliest inks were dyes made using metals, pecan shells or seeds or ink using aquatic animals such as fish and octopus. Chinese ink is carbon ink.

Ink should be used of the same brand and color, not mixed; otherwise, it will produce precipitation, which is not conducive to writing. After each writing, the cap should be put on in time; otherwise, the ink on the nib will be dried out, and it will not go down well when writing again. If you want to change the use of a kind of ink, you should first wash and dry the pen before filling the new ink.