Liver of Sulfur

The chemical name was potassium polysulfide and it came in dry flakes the color of old teeth and it smelled, when dissolved in warm water, like the earth's interior, like volcanic vents, like the geothermal pools of Oren's childhood in Iceland where the sulfur rose from the ground in wisps of yellow-white vapor and the air tasted of something ancient, something pre-human, the chemistry of the planet before the biology arrived.

Oren dissolved a tablespoon of flakes in a glass jar of warm water.

The solution bloomed amber, then deepened to a dark tea. The smell filled the studio at once, the rotten-egg stench that was liver of sulfur's signature. Visitors always recoiled from it. Oren noticed it the way a baker noticed bread: as evidence that the work had begun.

He had uncovered the memorial bronze.

It sat on the worktable in the morning light, the penny-colored surface that Giuseppe had chased to perfection three weeks ago, and Oren looked at it the way he always looked at a bronze before beginning a patina — assessingly, completely, the way a painter looks at a blank canvas not as an absence but as a potential, the surface waiting to be transformed, the raw material waiting for the chemistry that would give it its final identity.

The bronze was clean.

He had degreased it the previous evening with acetone, wiping every surface with cotton cloths soaked in the solvent, removing fingerprints, oils, and the microscopic film of oxidation that had formed while the bronze sat under its cloth. Cleanliness was the foundation of patina, the condition under which one material could bond with another.

Lina came down at nine.

She had brought a stool from the kitchen, the wooden stool that she used to reach the high shelves, and she placed it in the doorway of the studio, at the threshold between the studio and the alley, where the air from outside would move past her and carry the chemical fumes away rather than toward her, and she sat on the stool with a cup of tea and a book — Jansson again, the Moomins — and she said, I am ready.

Oren said, The smell will be bad.

She said, I have smelled worse.

He said, When.

She said, The hospital in Pisa, and this was true and was also funny and she smiled when she said it and the smile was the asymmetric smile that Katla had inherited, the right side higher than the left, and Oren turned to the worktable because the smile had done something to his chest that he could not afford to feel while holding a torch.

He picked up the torch.

The torch was a standard propane torch, the kind available at any hardware store, with a self-igniting tip and an adjustable flame. Oren used it for everything — heating the bronze, accelerating reactions, drying the patina between coats — and it was as familiar in his hand as a pen in a writer's hand.

He lit the torch and began to heat the bronze.

The flame was blue at the base and yellow at the tip. He played it over the memorial in long slow passes, bringing the temperature up gradually. Thermal shock could warp the bronze or crack the patina about to be applied, and patience in the heating was patience in the result. Oren was patient with bronze, more patient than he was with himself, more patient than he was with the disease, because bronze rewarded patience and the disease did not.

The bronze changed color as it heated.

It went from bright penny to darker copper, then to a purple-brown almost like plum. The surface was open. Oren set down the torch, picked up a wide flat hog-bristle brush, dipped it in the liver of sulfur solution, and applied the first stroke.

The bronze darkened on contact.

The change was immediate: bright copper to amber to brown in the space of a second. Potassium polysulfide reacted with the copper in the alloy to form copper sulfide, a dark compound that adhered to the surface. In chemical terms, it was corrosion, controlled and deliberate, the work of decades performed in seconds.

He worked the brush across the surface in long overlapping strokes, the dark color spreading like a shadow across the bright metal. Then he picked up the torch and brought the flame close to the wet surface. The heat accelerated the reaction. The brown went darker, deeper, developing a richness that cold application could not achieve. Oren controlled the heat the way a conductor controlled tempo, increasing it here, decreasing it there, holding it steady where steadiness was required.

Lina watched from the stool.

She watched with the stillness of a person seeing something she had heard about for twenty-six years but had never seen up close. Lina had always given Oren's studio a wide berth, respecting the boundary between her world and his with a precision that was also care. Now she sat in the doorway of his world, and the categories that had held — his work, her work, their shared life — began to shift into something less orderly and more true.

He applied the second coat.

The second coat went on darker than the first, the chemical building on itself, each layer adding depth to the one below it, and the surface was developing the character of old leather now, a deep brown-black with warm undertones, the liver of sulfur's signature color, the color that was the foundation of every green patina because the green needed the dark beneath it the way a painting needed the ground beneath the color, the darkness giving the light something to be light against.

Between the second and third coats he rinsed the bronze with clean water.

The rinsing removed the excess chemical, the unreacted potassium polysulfide that would keep darkening the bronze until no later color could penetrate it. Rinsing was editing: removal, restraint, a decision about where to stop. The chemicals and temperatures could be learned from a manual. Stopping could only be learned from the thousands of surfaces that had trained the eye toward the difference between enough and too much.

He applied the third coat.

And the fourth.

And the fifth.

Each coat was thinner than the last, the solution more dilute, the application lighter, the torch farther from the surface. The later coats were about nuance rather than coverage, bringing the dark surface to the point where it would accept the green of the cupric nitrate without resisting or swallowing it. The point was not a number or a formula. It was a feeling in the hands, the accumulated knowledge of thirty-one years.

He stopped.

The memorial bronze sat on the worktable no longer penny-colored, no longer bright, no longer raw. It was dark. It was deep. It was the color of earth after rain, the color of old walnut, the color of a surface that had absorbed something and been changed by it. Oren looked at it and asked the only question that mattered: Is this the foundation the green can build on?

It was right.

He set down the brush and the torch and turned to Lina.

She was still on the stool, the tea finished, the book unopened in her lap, and she had been watching for two hours without speaking, without moving, and her face had the expression he had seen at the pour — the expression of complete attention, the attention that was indistinguishable from reverence — and she said, The dark is beautiful.

He said, The dark is the beginning. The green will come tomorrow.

She said, I know. But the dark is beautiful by itself. Before the green.

He understood. She was not only talking about bronze. She was talking about stages, about the dark being beautiful before the green, the green before the wax seal, the wax before the weathering. Each state of the surface was complete before it was replaced. Oren thought of Lina's illness then, of the stages he kept treating as steps toward an end instead of states that still asked to be seen.

She said, Can I touch it.

He said, When it is cool. The chemicals are still active. Let it cool for an hour.

She said, I will come back in an hour.

She went upstairs with the stool and the book and the empty tea cup. Oren stood in the studio and looked at the dark bronze.

The dark is beautiful by itself.

He kept the sentence the way he kept formulas, as knowledge that would bear on the work.

He cleaned the brushes.

He capped the jar of liver of sulfur solution and set it on the shelf beside the others — cupric nitrate, ferric nitrate, ferric chloride, bismuth nitrate, selenious acid. The patinator's palette was as varied as a painter's and more volatile, every color dependent on chemical, concentration, temperature, humidity, application, and time.

This was the thing about patina that he loved most.

Not the colors, though the colors were extraordinary. Not the technique, though the technique satisfied him. Not even the transformation. What he loved most was the unrepeatability. Even with the same chemicals, the same concentrations, the same temperature, and the same alloy, the result would be inflected by humidity, brush speed, torch distance, and the thousand variables that could not be controlled. That was what made patina art rather than manufacturing: each surface a conversation rather than a monologue.

An hour later Lina came back.

She came down the stairs and into the studio and walked to the worktable and she put her hand on the bronze.

Her hand was pale against the dark surface, almost translucent now, veins visible beneath the skin, bones visible beneath the veins. The treatment had thinned her the way burnout thinned the shell, removing material, reducing mass. Her hand rested on the bronze, and the contrast — pale skin, dark metal — said what Oren could not.

She said, It is warm.

He said, The liver of sulfur generates heat. The reaction is exothermic. The surface will be warm for another hour.

She said, It feels alive.

He said, It is not alive.

She said, I know. But it feels alive. The warmth. The texture. The way it holds the hand.

She kept her hand on the bronze. Oren watched the warmth of the chemical reaction meet the warmth of living skin. The contact was the point, the moment between the maker's wife and the maker's work. This touch was itself a patina: a trace of the living on the surface of the lasting.

She lifted her hand.

There was a faint mark where her palm had been, a lighter place where the oils of her skin had altered the still-active patina. Oren thought: I should clean that. Neutralize it with acetone. Restore the surface.

Then he thought: No. Leave it. Let her hand be on the bronze.

He left the mark.

It would be covered by the green. The cupric nitrate would go over it and the mark would vanish under the new color. But it would remain underneath, invisible and structural, each layer containing the one before it.

Lina's handprint was on the memorial.

It would be there when the bronze was installed in Valentina Conti's garden, when the green patina was complete, when the lemon trees and rosemary and jasmine surrounded it, when the rains of the Castelli Romani began their slow work. Under all of it, invisible and undetectable, would be the mark of Lina's hand.

Oren cleaned the studio, put away the tools, and turned off the light. Upstairs, Lina was in the kitchen making dinner. The moka pot was on the stove. Evening was beginning. The dark was beautiful by itself, and the green would come tomorrow.