How To Make Walnut Ink Crystals

You can make walnut ink crystals by collecting black walnut hulls, boiling them down into a concentrated dye, and then drying that liquid into crystal-like chunks you rehydrate later.

 

It sounds a bit old-school, and honestly it is, because this is the same basic method artists and scribes have used for centuries to create rich, warm brown ink.

 

If you’ve ever wondered how to make walnut ink crystals from scratch, the good news is you don’t need fancy equipment, just patience and a good supply of black walnuts.

 

In this post, we’ll walk through how to make walnut ink crystals step by step, from gathering hulls to storing your finished crystals.

 

Let’s dive in.

 

How to Make Walnut Ink Crystals

 

Learning how to make walnut ink crystals starts with understanding what you’re actually making.

 

Walnut ink crystals are essentially the dehydrated solids of a concentrated walnut dye solution.

 

When you dry that solution, the remaining solids clump into shiny, dark crystals you can dissolve in water whenever you need ink.

 

You make walnut ink crystals by simmering hulls, straining the liquid, and evaporating it down until only crystallized solids remain.

 

Here’s the full process broken down.

 

1. Gather Your Black Walnut Hulls

 

To make walnut ink crystals, you need the green outer hulls of black walnuts, not the hard shells inside.

 

Those hulls are packed with juglone, the natural compound responsible for that deep brown stain.

 

Wear gloves while handling them unless you want your hands stained for a week.

 

 

2. Simmer the Hulls

 

Cover your hulls with water in a pot and bring them to a gentle simmer.

 

Let them cook for a couple of hours until the water turns dark, almost like strong coffee.

 

This is the liquid you’ll later turn into walnut ink crystals.

 

 

3. Strain and Reduce

 

Strain out the hulls and return the dark liquid to the pot.

 

Keep simmering on low heat until the volume shrinks dramatically.

 

You’re concentrating the liquid so it will eventually dry into walnut ink crystals.

 

 

4. Dry Into Crystals

 

Pour the thickened liquid into a shallow tray and let it air dry.

 

As the water evaporates, the solids harden into brittle, glassy chunks.

 

Congratulations, you’ve just made walnut ink crystals.

 

Supplies You’ll Need to Make Walnut Ink Crystals

 

Before you start making walnut ink crystals, gather a few basics.

 

1. Black Walnut Hulls

 

Fresh green hulls work best for walnut ink crystals because they hold the most juglone.

 

 

2. A Large Pot

 

Use one you don’t mind staining, because making walnut ink crystals will leave its mark.

 

 

3. Strainer or Cheesecloth

 

This helps separate the solids so your walnut ink crystals come out clean.

 

 

4. Shallow Drying Trays

 

These give the liquid more surface area to evaporate into walnut ink crystals faster.

 

Tips for Better Walnut Ink Crystals

 

A few small tweaks can make a big difference when you make walnut ink crystals.

 

1. Add a Little Alcohol

 

A splash of rubbing alcohol or vodka helps prevent mold in your walnut ink crystals.

 

 

2. Add Gum Arabic

 

Stirring in gum arabic improves flow when you rehydrate your walnut ink crystals into usable ink.

 

 

3. Store Them Dry

 

Keep your walnut ink crystals in an airtight jar away from moisture so they last for years.

 

4. Test as You Go

 

Dip a brush in the liquid before drying to check the shade of your future walnut ink crystals.

 

So, How Do You Make Walnut Ink Crystals?

 

You make walnut ink crystals by simmering black walnut hulls, straining the liquid, and drying it down into crystalline solids.

 

It’s a slow process, but that’s part of the charm of learning how to make walnut ink crystals at home.

 

Once you’ve made walnut ink crystals, just dissolve a few in water whenever you want rich, natural brown ink for drawing, calligraphy, or journaling.

 

Happy inking.