Process of Art Decoration: William A. Johnson; Patent No. 393,763
The patent by William A. Johnson of Bangor, Maine, describes a Paint-Vehicle and Decorative Process (Patent No. 393,763). This invention is a specialized chemical medium (vehicle) and a physical application method designed to create high-end aesthetic finishes on interior surfaces, furniture, and statuary using inexpensive, accessible materials.
The “Why”
In the late 19th century, interior decoration—specifically ornate wallpaper, dados, and friezes—was a labor-intensive luxury reserved for the wealthy. Standard oil paints were slow-drying and difficult to “stamp” or texture without blurring. Johnson sought to solve the pain point of prohibitive cost and technical complexity in home beautification, providing a DIY-friendly method that offered the “elegant” look of professional engravings or expensive wallpaper at less than one-third of the cost.
Inventor Section: William A. Johnson
William A. Johnson was an innovator operating during the post-Reconstruction era, a time when Black inventors faced significant systemic barriers to securing capital and manufacturing. His engineering philosophy centered on chemical accessibility and democratization. By utilizing household ingredients—vinegar, salt, and sugar—as a sophisticated chemical vehicle, he bypassed the need for expensive industrial solvents. His work reflects the “make-do-and-mends” ingenuity often found in Black industrial history, where high-level results were achieved through the masterful manipulation of common materials.
Key Systems Section
The Chemical Vehicle (Solvent & Binder)
Instead of a traditional oil-based medium, Johnson engineered a volatile aqueous solution.
- Acetic Acid Base: Using cider vinegar as the primary solvent allowed for a quick-evaporating medium.
- Fixatives: The addition of saltpeter ($KNO_3$) and common salt ($NaCl$) acted as mordants to help the “dry paint” (pigment) adhere to the surface.
- Surface Tension Modifiers: The inclusion of “German cologne” and whisky (ethanol) reduced surface tension, allowing for a “smooth coat” that wouldn’t bead up on furniture or plaster.
The “Stamp” Mechanism (Putty Lithography)
Johnson utilized a unique rheological approach to pattern making.
- Malleable Die: By using soft putty, the user could hand-sculpt a custom “fac-simile” of flowers or leaves.
- Displacement Stamping: Because the paint vehicle remained “open” (wet) for a specific window, the putty stamp could displace the pigment to create a high-contrast relief or “impression.”
The Finishing System
- Rapid Dehydration: The chemical composition was designed to dry “in a few minutes.”
- Protective Lamination: A final coat of furniture varnish provided the durability that the water-based vehicle lacked, effectively “locking” the pigment in place.
Comparison Table
| Feature | Standard Methods (1880s) | Johnson’s Innovation |
| Medium | Heavy Oils / Leads | Aqueous Vinegar-Based Vehicle |
| Application | Professional Brushing/Stencil | Sponge Application & Putty Stamping |
| Drying Time | 12–24 Hours | Minutes |
| Cost | High (Imported Wallpaper/Labor) | Low (Household Ingredients) |
| Customization | Fixed patterns | Hand-molded “on-the-fly” designs |
Significance Section
- Precursor to Faux Finishing: Johnson’s method is an early technical ancestor to “rag-rolling” and “sponge-painting” techniques popular in modern interior design.
- Early “Open Time” Chemistry: The specific ratio of sugar and salts was an early attempt to control the “open time” of paint—balancing fast drying with enough workability to stamp a design.
- Democratization of Design: By simplifying the process, Johnson empowered the working class to engage in “Art Decoration,” a field previously dominated by specialized guilds.
