Who doesn’t love a good pen?
Throughout 2023, we included a Sakura brush pen in each of our Mini One subscription boxes. We also created collections of pens to co-ordinate with our Big One subscription boxes. Below you’ll find all the reference numbers for pens we released.
For a really handy tracker page for your Koi Brush collection, take a look at the blog post written for us by our Creative Team member Claire.
For reference, here is the complete collection…
Mini One Reference Numbers:
| Colour | No. | Theme | Date |
| Lavender | 238 | Don’t Worry Be Happy | Nov 2022 |
| Red | 19 | SWALK | Dec 2022 |
| Green | 24 | Be Lucky | Jan 2023 |
| Yellow | 3 | Chasing Rainbows | Feb 2023 |
| Yellow Green | 27 | Eat the Frog | Mar 2023 |
| Vermillion | 18 | Pixels | Apr 2023 |
| Aqua Blue | 137 | Bite Me | May 2023 |
| Raw Umber | 47 | Mr Know-It-Owl | Jun 2023 |
| Deep Yellow | 4 | It’s Bananas | Jul 2023 |
| Raw Sienna | 14 | Autumn Leaves | Aug 2023 |
| Cool Grey | 44 | Click It | Sep 2023 |
| Blue Green Light | 28 | Christmas Tree Lane | Oct 2023 |
Big One Reference Codes:
| Colour | No. | Theme | Date |
| Orange | 5 | Untamed | Mar 2023 |
| Sky Blue | 125 | Untamed | Mar 2023 |
| Purple | 24 | Untamed | Mar 2023 |
| Iris | 124 | Untamed | Mar 2023 |
| Pink | 20 | Untamed | Mar 2023 |
| Light Purple | 224 | Pocket Full Of Sunshine | Jun 2023 |
| Lemon Yellow Light (NEW) | 202 | Pocket Full Of Sunshine | Jun 2023 |
| Peacock Green | 426 | Pocket Full Of Sunshine | Jun 2023 |
| Lilac | 123 | Pocket Full of Sunshine | Jun 2023 |
| Bordeaux | 223 | Pocket Full of Sunshine | Jun 2023 |
| Black | 49 | Wild Journaling | Sep 2023 |
| Magenta Pink | 421 | Wild Journaling | Sep 2023 |
| Woody Brown | 407 | Wild Journaling | Sep 2023 |
| Dark Brown | 110 | Wild Journaling | Sep 2023 |
| White (Gelly Roll) | xx | Wild Journaling | Sep 2023 |
| Light Sky Blue | 237 | Become | Dec 2023 |
| Naples Yellow | 9 | Become | Dec 2023 |
| Plum Rose (NEW) | 422 | Become | Dec 2023 |
| Grayish Blue (NEW) | 41 | Become | Dec 2023 |
| Prussian Blue | 43 | Become | Dec 2023 |
Unused Colours
Original 48 Colours – 22 unused
| Pale Orange | 7 |
| Coral Red | 205 |
| Pale Brown | 212 |
| Brown | 12 |
| Salmon Pink | 107 |
| Rose Red | 221 |
| Burgundy | 22 |
| Fuchsia | 222 |
| Greyish Purple | 42 |
| Cerulean Blue | 25 |
| Steel Blue | 225 |
| Blue | 36 |
| Viridean | 31 |
| Sap Green | 130 |
| Fresh Green | 32 |
| Emerald Green | 226 |
| Ice Green | 128 |
| Dark Warm Grey | 144 |
| Warm Grey | 45 |
| Light Warm Grey | 145 |
| Dark Cool Grey | 46 |
| Light Cool Grey | 153 |
New Colours (7 unused)
| Naples Yellow Pale | 109 |
| Vermillion Light | 218 |
| Lavender Light | 438 |
| Sky Blue Pale | 425 |
| Orient Blue | 243 |
| Lime Green Light | 228 |
| Moss Green Pale | 230 |