George Vondriska

What is Chatoyance?

George Vondriska
Duration:   4  mins

Description

Like snowflakes, no two pieces of wood are exactly the same. That’s one of the things that makes woodworking so much fun. Like Forrest Gump said (using a little artistic license), wood is like a box of chocolates. You never know what you’re gonna get. It’s so cool to clean up a piece of wood, the right piece of wood, and see amazing grain start to pop out at you.

Chatoyancy

The characteristic we’re specifically looking at here is chatoyancy. Now, there’s no such thing as chatoyance wood. Chatoyance is a characteristic that shows up in some pieces, not in others. There’s no specific specie we can call chatoyance wood. That being said, it seems to show up with the most frequency in maple.

Cause

One cause of chatoyance is the tree being under stress as it grows, causing the grain to curl back on itself. This results in an effect that basically looks like waves within the wood. This is an amazing and beautiful 3D look that changes as you look at the wood from different angles.

How do I know how it’ll look?

You can see chatoyancy in wood, to some extent, as soon as you start to clean up the surface. The smoother the wood gets, the more the chatoyancy will show up. But the real trick is to use mineral spirits to show the wood grain. This gives you a great idea of what the piece will look like under finish.

But wait, there’s more

There are so many amazing aspects of wood. That’s why we have an entire section that deals with nothing but understanding wood. Spalting, expansion and contraction, bark inclusions–there are so many things that make each piece of wood unique.

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4 Responses to “What is Chatoyance?”

  1. Ann

    I have been a professional woodworker for over 40 years. What you are showing here is curly maple which is poor example of chatoyance. Quilted maple which your piece does not have is a very good example of chatoyance.

  2. Rob Wallace

    A better explanation of chatoyance is that it is an OPTICAL property of the cell structure of the wood. Woods do not have to be quilted to show chatoyance, which is implied in the explanation provided in the video. There are different variations of cell structure that give ‘highly figured’ characteristics, but not all have the refractive and reflective properties that produce chatoyance. It is necessary to distinguish the concepts of structural differences in “figure” and the unique optical properties that give rise to chatoyance in wood.

  3. Randy Hermann

    Thanks for the explanation. I hope we get to see the next steps with these boards, the dye and finished products.

  4. Ken

    I have 5 - 8 ft Maple boards which look like the one in this video. Ken

What the heck is chatoyance? Chatoyance is amazing, is what it is. Chatoyance is from the French, and what it really means, is shine like a cat's eye, and that's what effect we get, in the right piece of wood. Here's what I'm talking about. When you look, especially in this piece of maple wood, when you look right down this edge, it kinda looks like there's still sawmill marks here, and this was band saw cut, so when I got it, there were marks going across it. It sanded really, really smooth. Those are not sawmill marks, this is the chatoyance in the wood, and what it is, is in this maple, we would say this is a little bit of quilted maple. Chatoyance is the effect that the quilting has, which is, when we look at it, it has this very cool, three dimensional look to it. So, here's what I'm gonna do. Got a couple of different pieces for this table, available, and I'm gonna throw some mineral spirits on here, and that's gonna really pop the grain so you can better see what I'm talking about. Then I'm gonna do it to that piece as well, and we'll do a little visual science experiment. It's interesting in classes I've had, it's happened pretty often that I see somebody, sanding and sanding and sanding and sanding on a piece of wood, and I feel like, well that sanding should have been done long, you know, this should be done by now, what's going on? So, when I look at it, what they say is, "Well, I'm trying to get these defects sanded, I'm trying to get these ridges sanded out", but when you feel this, it's smooth as a mirror, but it looks like there are marks in the wood, that have to come out, and they're not, they're in the grain, so you're not going to get them to come out. All right, a little mineral spirits, so you can see what I'm so excited about here. Just getting that wet with the mineral spirits, look at that dramatic grain right there, it's amazing. On this piece, let's do the same thing, and the reason I'm doing it to the smaller piece is, what happens when you're looking at material, that has this effect, when you move side to side, it's a little bit like a holographic picture. When you move your head, it changes the appearance of the chatoyance, and that's what I'm gonna try to get for you here, is get this quilting wet, and then, by doing this. One of the things that's just so neat, and I can see it, looking down the board this way, is just the way that it gives it that amazing three dimensional look. So, where are we at here? One, what is chatoyance? Chatoyance is this shimmering effect that we get from wood. Again, remember, it literally means shine like a cat's eye, so it's got that sparkle to it. If you've ever seen a piece of the semi-precious gem, tiger's eye, same thing, that's what it looks like. Two, when you have quilted maple, like I have here, any piece of wood that's got this kind of quilting in it, then we get finish on it, that's when that really starts to pop. Now, to take this a step further, what I'll be doing with this table, is using aniline dye, to introduce some color to it. Then, after the aniline dye is saturated in the surface, a light sanding leaves the dye in the bottom of the quilting, and then I'll topcoat over the top of that, and that's gonna really help it pop. So, if you don't wanna go as far as the dye, but you do wanna accentuate this, any finish that's got, kind of, an amber tone to it, shellac, solid based lacquer, the water-based products tend to be really really clear, and they're not gonna give you that amber tone. Boiled linseed oil would be another great example, of a finish that will really help pop that chatoyance. So, now you know what it is, you know to not bother trying to sand it out, and it can really add a hugely dramatic effect to a woodworking project.
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