5.3 Collagraphy, Collage, Assemblage, and Mixed-Media 2D Systems

Collagraphy, Collage, Assemblage, and Mixed-Media 2D Systems

Contemporary two-dimensional studio practice increasingly dissolves the boundaries between traditional printmaking, painting, drawing, and sculptural relief. Through collagraphy, collage, assemblage, and hybrid mixed-media systems, artists combine disparate tactile textures, chemical binders, and found ephemera. For visual arts educators, navigating these hybrid systems requires understanding not only expressive composition but also material structural compatibility, chemical adhesion, and international print documentation standards.

1. Collagraphy: Additive Matrix Fabrication and Topography

Coined in the 1950s by artist Glen Alps at the University of Washington, collagraphy (derived from the Greek colla [glue] and graph [to draw]) is an additive printmaking process. Instead of excavating into wood or chemically biting metal, the artist constructs a textured printing matrix by collaging diverse physical materials onto a rigid backing board.

Collagraph Plate Cross-Section:
[Brayer Relief Ink]  ===             ===       === (Top Peaks)
[Tarlatan Ink]          |_|  ~.~.~  |_|  ~.~.~     (Recessed Crevices)
[Sealing Film]       -----------------------------
[Textural Collage]   [Card]  [Sand] [Lace] [Paste]
[Rigid Substrate]    =============================
                     (Masonite / Matboard Core)

Substrate Selection and Dimensional Thresholds

• Substrate Materials: The base plate must be flat, rigid, and dimensionally stable under moisture and pressure. Preferred substrates include tempered Masonite (hardboard), birch plywood, heavy museum board (100% rag 8-ply matboard), or rigid aluminum sheets. Thin cardboard or lightweight chipboard is unsuitable because it warps violently when coated with wet glues or run through a printing press.
• Low-Relief Height Threshold: To prevent destroying press felts, snapping the matrix, or fracturing the press rollers, the maximum relief height of collaged materials must not exceed 1/8 inch (approximately 3 mm). All elements must maintain gentle, sloping transitions rather than sheer, razor-sharp vertical drops.

Collaged Textural Media and Tone Generation

In collagraphy, value and tone are determined by the microscopic porosity and physical roughness of the collaged materials:

• Carborundum (Silicon Carbide Grit): Coarse to fine grit mixed with acrylic gloss medium or PVA glue creates a dense, sandpaper-like tooth. When wiped as an intaglio, carborundum traps massive amounts of ink, printing as profound, velvety, light-absorbing blacks.
• Fabrics and Fibers: Lace, burlap, cheesecloth, cotton thread, and torn mulberry papers provide intricate woven textures and linear cross-hatching.
• Modeling Pastes and Gesso: Acrylic modeling paste, gel mediums, and gesso can be sculpted, combed with notched trowels, stippled with stiff bristle brushes, or carved into once dry.
• Found Organic/Manufactured Ephemera: Dried plant leaves, crushed eggshells, torn masking tape, foil, and sandpaper provide organic textures.

The Imperative Matrix Sealing Phase

The most technically critical step in collagraph fabrication—and a frequent pitfall in high school art studios—is plate sealing:

• The Degradation Mechanism: Untreated collaged materials (cardboard, string, dried paste, paper) are highly porous and absorbent. If an unsealed collagraph plate is inked with oil-based ink and run through a press against damp paper, the porous matrix will absorb the ink vehicle and water, acting as a powerful glue. The damp cotton paper will fuse permanently to the matrix, tearing the print to shreds and destroying the plate.
• Sealing Protocol: The completed collagraph plate must be thoroughly sealed on both sides and all four edges with 2 to 3 thin, even coats of waterproof sealant—such as gloss acrylic medium, polyurethane varnish, or orange/blonde shellac thinned with denatured alcohol. Sealing the back prevents moisture from warping the plate. The sealant must cure to a hard, slick, non-tacky finish before any inking begins.

2. Inking and Printing Mechanics of Collagraphs

Because a sealed collagraph plate possesses both deep textural crevices and flat raised plateaus, it can be inked through multiple printmaking modes:

• Intaglio Inking: Oil-based intaglio ink is worked across the entire plate with a card or brush, pushing pigment into every textural crevice. The printer then folds a tarlatan pad and gently wipes the top surfaces clean. The ink trapped inside the woven lace, sand grit, and modeled crevices transfers under press pressure, creating rich tonal shadows and textured lines.
• Relief Inking: A firm rubber brayer charged with relief ink is rolled lightly across the top peaks of the collaged plate. The ink touches only the highest planar surfaces, leaving the deep recessed textural valleys pristine white.
• Viscosity Printing (The Hayter Method): Developed by Stanley William Hayter at Atelier 17 in Paris, viscosity printing allows multiple colors to be printed simultaneously from a single plate in a single pass through the press:
  1. The plate is first inked as an intaglio with a stiff, high-viscosity (thick, low-oil) ink and wiped.
  2. A hard-density rubber brayer charged with a second color of medium-viscosity (moderately oily) ink is rolled across the plate under firm pressure.
  3. A soft-density gelatin brayer charged with a third color of low-viscosity (very oily, thin) ink is rolled lightly across the plate.
  4. The Chemical Rule of Viscosity: A thin, oily ink will not adhere to a stiff, dry ink (it repels), but a stiff ink will reject an oily ink. The varying roller hardnesses contact different physical heights of the relief, while ink viscosities prevent colors from blending into mud on the plate, pulling a vibrant polychrome print in a single press run.
• Press Bed Packing: Because collagraph plates have varied topography and sharp structural transitions, the press bed requires extra cushioning. The printer uses a softer, thicker wool cushion felt (or adds a sheet of high-density compressible neoprene foam) over the sizing catcher to ensure damp paper molds smoothly around raised elements without cutting the blankets.

3. Collage, Assemblage, and 2D Material Systems

In addition to matrix printing, artists construct direct two-dimensional compositions through collage and low-relief assemblage:

Historical Foundations and Movements

• Collage (Papier Collé): Derived from the French verb coller ("to paste"). Pioneered in 1912 by Pablo Picasso (Still Life with Chair Caning) and Georges Braque during the Synthetic Cubist movement. By pasting real-world oilcloth, wallpaper, and newspaper fragments directly onto the canvas, Picasso and Braque dismantled Renaissance pictorial illusionism, asserting that the artwork is an autonomous physical construction rather than an optical window into nature.
• Dada Photomontage: In Weimar Germany, Berlin Dadaists Hannah Höch, John Heartfield, and Raoul Hausmann utilized cut-and-pasted photographic fragments, mass-media advertisements, and political headlines to create searing satirical critiques of militarism, bourgeois morality, and fascism.
• Modernist Narrative Collage: African American master Romare Bearden transformed collage into a monumental narrative medium, combining magazine clippings, hand-painted papers, and photographic reproductions to depict the complexities of Black American life, Southern memory, Harlem street culture, and jazz improvisation.
• Assemblage: Extends collage into low-relief three-dimensional space by incorporating non-art found objects (objets trouvés), industrial hardware, scrap wood, and architectural fragments mounted to a 2D panel or shadowbox. Celebrated exemplars include Joseph Cornell's glass-fronted surrealist shadowboxes and Louise Nevelson's monumental monochromatic painted wood wall reliefs (Sky Cathedral).

Archival Adhesive Systems vs. Studio Hazards

In visual arts classrooms, the selection of adhesives governs both immediate bonding success and the long-term conservation of the artwork:

• Archival, pH-Neutral Adhesives:
  • Polyvinyl Acetate (PVA, e.g., Lineco Neutral PVA): A water-based, pH-neutral synthetic emulsion that dries clear, flexible, and permanent. Excellent for mounting papers, fabrics, and heavy boards without acid embrittlement.
  • Methyl Cellulose / Wheat Starch Paste: Traditional, reversible, plant-based conservation adhesives. Highly favored in book arts and paper repair because they can be reactivated and released with water decades later without damaging cellulose fibers.
  • Acrylic Gel Mediums (Gloss/Matte): Formulated with 100% acrylic polymer emulsion. Functions simultaneously as an adhesive, sealer, and textural body. Bonds paper, canvas, wood, and lightweight objects permanently with archival permanence.
• Hazardous / Non-Archival Studio Adhesives:
  • Rubber Cement: Formulated with synthetic polymers dissolved in solvent carriers (such as n-heptane and hexane). While popular in commercial graphic design paste-ups for its temporary repositionability, rubber cement is strictly non-archival. Over time, its solvents oxidize and turn highly acidic, causing severe yellow-brown staining, bleed-through, embrittlement, and ultimate complete bond delamination. Furthermore, inhaling volatile solvent vapors poses chronic neurotoxic hazards in unventilated classrooms.
  • Spray Adhesives: Generate aerosolized droplets of toxic solvents (hexane, acetone) that linger in classroom breathing zones, presenting severe respiratory and explosive flash-fire hazards unless used inside an active chemical spray booth.

4. Mixed-Media Layering Chemistry: The "Fat Over Lean" Canon

When combining wet and dry drawing, painting, and collage media on a single two-dimensional support, the artist must adhere to the physical laws of paint drying chemistry:

The Fundamental Principle: "Fat Over Lean"

Originating in classical oil painting, the fat-over-lean rule governs all oil-based layering systems:

• Lean Layers: Formulated with a low oil (fat) content, diluted heavily with mineral spirits or turpentine, and high in pigment. Lean paint dries quickly through solvent evaporation, creating a hard, inflexible, porous paint film.
• Fat Layers: Formulated with a high oil content (pure linseed oil, stand oil, or walnut oil added to tube paint). Fat paint dries very slowly through chemical oxidation and polymerization, curing into a flexible, elastic, non-porous film.
• The Mechanics of Failure: If a brittle, fast-drying "lean" layer is applied over an elastic, slow-drying "fat" layer, the top layer dries and forms a rigid crust while the soft underlayer is still expanding, contracting, and curing beneath it. This differential movement inevitably causes the upper paint film to crack, craze, wrinkle, and flake off.

Paint Chemistry Layering Hierarchy:
[Oil Paint / Fat Layers]   ==== Slow-drying, flexible, oil-rich (Top)
[Lean Oil Underpainting]   ---- Fast-drying, rigid, solvent-thinned
[Dry Acrylic Gesso/Paint]  #### Water-based polymer (Porous ground)
[Rigid Panel / Linen]      ==================================== (Support)

CRITICAL RULE: Acrylic can go UNDER oil;
               Acrylic can NEVER go OVER oil or wax.

Water-Based Media vs. Oil-Based Media Compatibility

• The Golden Interfacing Rule: Water-based media (acrylic paint, acrylic gouache, watercolor, India ink) dry via water evaporation into water-insoluble, flexible acrylic polymer films. Oil paint can be applied safely on top of thoroughly dried acrylic paint or acrylic gesso because the porous acrylic surface provides an excellent mechanical tooth for oil adhesion.
• Compatibility check: Ordinary water-based paint is usually unsuitable over a fresh, oily or waxy layer because wetting and adhesion can fail. Use materials and supports specifically approved for the intended combination. Specialized mixed-media products may have different instructions; a blanket claim that all water-based materials require a porous surface is incorrect.
• Friable Dry Media Stabilization: When incorporating dry, powdery media (such as charcoal, soft pastel, or graphite) beneath wet acrylic, collage adhesives, or oil glazes, the drawing must be sealed with a light coat of workable fixative (resin in alcohol solvent). If left unsealed, the loose pigment particles will mix into wet adhesives, turning paints muddy and preventing adhesive contact with the paper substrate.

5. Print Editioning Notation and Professional Standards

In fine art printmaking, maintaining rigorous cataloging and inscription conventions is critical for legal authenticity, provenance, and market valuation. All inscriptions are penciled directly into the lower paper margin beneath the plate mark or image boundary using a soft graphite pencil (such as a 2B), because pencil embeds carbon into paper fibers and cannot be chemically altered or photocopied cleanly.

Standard Fine Art Inscription Layout:
[           PRINTED IMAGE AREA / PLATE MARK           ]

 12/50                     "Urban Rhythm"            Jane Doe, 2026
 [Edition Fraction]        [Title in Quotes]         [Signature & Year]
 (Lower Left Margin)       (Lower Center Margin)     (Lower Right Margin)

The Standard Inscription Format

1. Lower Left Margin (Edition Fraction): Written as an Arabic fraction (e.g., 12/50). The denominator denotes the total number of prints in the limited edition; the numerator indicates the individual impression number within that run. The numerator reflects printing sequence or inventory order and does not imply superior artistic quality.
2. Lower Center Margin (Title): The title of the artwork, enclosed in quotation marks (e.g., "Urban Rhythm").
3. Lower Right Margin (Signature and Date): The legible handwritten signature of the artist and the year of pulling (e.g., Jane Doe, 2026).

International Proof Notations

Beyond the numbered limited edition, printmakers pull specialized impressions designated by recognized abbreviations in the lower left margin:

• A/P (Artist's Proof / Épreuve d'artiste [E.A.]): Impressions reserved exclusively for the artist's personal archive or private sale. In fine art ethics, the total number of Artist's Proofs should not exceed 10% of the overall edition size (e.g., maximum 5 A/P prints for an edition of 50). If multiple A/Ps are pulled, they are numbered sequentially (e.g., A/P 1/5).
• B.A.T. (Bon à Tirer - French for "Good to Pull"): The single definitive master impression approved and signed by the artist. It is handed to the master printer in a professional atelier to serve as the uncompromised qualitative standard; every editioned print pulled thereafter must match the B.A.T. in inking, wiped values, registration, and paper conditioning. Only one B.A.T. exists per edition, and it remains the property of the press.
• P/P (Printer's Proof): Impressions gifted to or retained by the printing press, master printer, or collaborative assistants as complimentary compensation or shop records.
• T/P (Trial Proof) and State Proofs: Pulled during the working development of the matrix to inspect line depth, value balance, or compositional changes before the matrix is finalized. State proofs document historical shifts in the design (e.g., Rembrandt's famous progressive states of The Three Crosses).
• Cancellation Proof: Pulled after the edition run is complete and the matrix has been defaced (e.g., by scribing a deep "X" across the plate or drilling holes through it). Guarantees collectors that no further impressions can ever be produced from the matrix.

6. Comparative Overview: 2D Collage, Collagraphy, and Mixed-Media Systems

The following table outlines matrix construction, media compatibility, adhesive selections, and primary studio failure modes across hybrid two-dimensional media: