Search query: color changing ink calligraphy

Product: ZZKOKO Calligraphy Pen Ink, 10 Colors Fountain Dip Pen Ink Set Non-Carbon Drawing Writing Art Craft Calligraphy Inks Bottles, 15ml Bottle 10 Colors Set

Difference between carbon ink & non-carbon ink:
Carbon ink is a special black pigment ink. The advantage is that it is particularly black and has a strong handwriting. This is also a common advantage of pigment ink. The disadvantage is that the carbon component is easy to precipitate, and then the pen is blocked, which is difficult to clean.
Non-carbon inks are not easy to block the nib, but the general color is not black enough compared to carbon ink, and the text is not stored for a longer period of time than carbon ink.

NON-CARBON INK: With high ink permeability, good fluidity, non-carbon inks will not cause clogged. Perfect for fountain pen, dip pen, scrapbooks, journals, drawing, sketching, and much more.
10 COLORS INK: Our laboratory ink formulation is made without animal by-products or dispersing agents, providing safe vibrant non-toxic soluble dyes, enabling optimal flow to give color brilliance with durable lightfastness that will not deteriorate or fade.
GREAT DECORATION, SWEET GIFT: This value pack can meet your different needs and passions about colorful creations. Very beautiful decoration for your desk at home and at the office. Great gift for graduation, birthdays and other special occasions.
PACKING: This set contains 10 bottles of different color(black, blue, red, green, purple, orange,brown,pink,bordeaux,turguoise), each one of them filled in 15ml glass bottle placed it in a foam mold gift box, and come with a secret gift in it!
If, for whatever reason, you don't absolutely love your pen ink set, just return it, no questions asked, or replace it, if there is a problem. ZZKOKO