Tonal Studies - Block Painting

This evening I began painting with pretubed Munsell values. I botched up the lighting here with  warm overhead fluorescent lighting and front facing balanced lighting--a better photo is coming once I finish up the cubes. I can envision tuning up individual cubes once everything dries but I think I have a reasonable and exciting starting point.

Tonal Studies - Block Prep

The blocks are nearly ready for painting with Munsell neutrals. The initial coats of GAC 100 might have lifted the grain, leaving me to try to smooth things out with sandable gesso. Getting there!

Tonal Studies - Block Making

Ah, such a long overdue project... Finally underway!

I lurk on rationalpainting.org where among many other topics members are encouraged to delve into using Munsell as a base for tonal studies. Rather than try to explain the details, I refer you to the wonderful work of Paul Foxton. Paul is building an art teaching website so be sure to look beyond his posts on tonal studies.

Starting with an eight foot 4x4 cut in half, I ripped it to about 2.5" square. This Freud blade cuts so smoothly that only minimal sanding was needed.

Using a power mitre box, the blocks were cut.

With the blocks cut out, it was time for a couple of coats of Golden GAC 100. I mixed in a bit of water, as I find this primer somewhat thick and seems to leave behind a bit of texture

The blocks are nearly ready for a few coats of Golden acrylic gesso but first I'm letting the GAC 100 get nice and dry. There's still a bit of tackiness here.

Munsell Gray Scale

I'm back after days of measuring, mixing and tubing. For results there are nine tubes of hand-mixed paint in Munsell values 1-9. It's probably impossible to reach the extreme values of 0 and 10 in paint. In the chart below Holbein Peach Black starts off the low end with a value of about 0.5. The high end is Gamblin Radiant White with about 9.75.

Apologies for this photo... Once the scale dries and can be scanned safely I'll post a better image.

More soon as I examine the chart in Photoshop and tune up the paints as needed.

Mixing a neutral

I've mixed and tubed Munsell neutrals N4, N6 and N8. No matter which neutral I am mixing, the process and paints are the same. Here's a look at the process.

Material and tools. 
Williamsburg Ivory Black, Rublev Cyprus Umber Medium and hand-mulled titanium dioxide. Munsell Neutral Value Scale Glossy, palette knives and glass palette.

Workspace layout.
All the paints are ready to mix. This is my mulling glass abraded with silicon carbide, although I use the smooth side for mixing. Abraded side is used for mulling only.

Testing mix accuracy.
It is best to test accuracy by applying paint directly; the glossy scale easily wipes clean. Note that at this time all we are matching for is N8 value; color matching comes later. Black is added to white bit by bit, constantly checking for spot on value.

Black/white mix completed.

Testing mix accuracy.
The umber and white is mixed to the same N8 value. Note that at this time all we are matching for is N8 value; color matching comes later. Reflection makes the paint sample look lighter here. Spreading the sample with a finger helps achieve an easier read.

Umber/white mix completed.
On the palette is now a pile of N8 leaning cool and a pile of N8 leaning warm.

True Munsell N8.
The two N8's are now mixed, testing all the time for value and hue. Although I say value and hue, it is assumed at this point that value should be spot on if prior mixing was completed accurately meaning that targeting the Munsell neutral hue is all that is needed. The photo details roughly the mid point in mixing. Note the three piles of paint: cool, true N8 and warm. In this case there was a bit of umber/left over. The true N8 mix was then tubed up.