How I Etched a Brass Plate with a Silhouette Cameo and Ferric Chloride

By TJ Murphy ·

I made this six-inch brass plate for Kara and Paul (Paul DJs as Sacramento), who run Friends Club, the festival in Lillooet where I painted the big mural. It shows the astronaut mascot from the mural in a raft with their dog, and Billy Buff riding in the back.

Finished Friends Club brass plate: the astronaut mascot in a raft with a dog and Billy Buff

Billy Buff comes from a skit. A friend lay upside down on a table with her head hanging off the edge and a buff over her eyes, playing a wonderfully unhinged character in a game. He has been part of the crew ever since.

Billy Buff, a face with a buff pulled over the eyes

This is my third plate, and I'm still new to etching. I bought a Silhouette Cameo to cut stickers for the mural, then found it cuts vinyl just as well on top of a brass plate. That vinyl becomes the mask.

Brass plate stock with its green protective film
The design in Silhouette Studio, ready to cut

The etch

I cut the design into the vinyl on the plate, picked out the lines and letters, and set it face up in a glass dish of ferric chloride for twenty minutes. Where the vinyl stays, the brass is protected. Where I picked it out, the acid bites in. Wear gloves and work somewhere well ventilated.

MG Chemicals 415 ferric chloride etchant
The brass plate etching in an orange bath of ferric chloride
The plate out of the bath with the vinyl mask still on

Ink and wipe

Next I brushed Alpha enamel over the whole plate, working it into the etched lines, and wiped the surface back with alcohol. The enamel stays in the grooves and the drawing comes up.

Alphanamel lettering enamel in McKeag's Black
The plate covered in black enamel before wiping

Last, I sealed it with a coat of Incralac to keep the brass from tarnishing.

Can of Incralac clear coating for copper, brass and bronze

Earlier plates

Before this one I made two others. One is an eagle flying over the water, from my painting of an eagle catching a fish at sunrise on Rainier. The other has a QR code and now hangs on the fence at Brian and Marco's. Brian says that whenever he sits outside, people stop to ask about it, and he tells them to scan it.

Two earlier brass plates: an eagle over water and a QR code plate

You can see more of my work at tjm.art.

If you'd like a plate like this for your place or your event, get in touch.