Composer Cage, whom Bradshaw met in 1977 through her longtime partner, the conceptual artist William Anastasi, helped her further refine the concept of indeterminacy that would shape all her future art. Bradshaw also collaborated with Cage on productions for the Merce Cunningham Dance Company. And like Rauschenberg, she has tried her hand at a few white paintings.
"Copper, Silver, Fool's Gold" spans four decades of Bradshaw's works using those metals, many of which have been chemically "activated" and are in a constant state of flux.
To get a reaction started in Notation V (2000), for instance, she dripped ammonium chloride and vinegar onto a small cube of copper atop a larger cube of white Vermont marble, putting in motion a reaction that causes the copper to leach turquoise streaks onto the marble.
In the three rectangular copper wall pieces from her "Without Title" series, Bradshaw created painterly streaks and drips by brushing the copper's surface with vinegar.
For Indeterminacy (1995), a piece of pyrite (fool's gold) on a cube of white marble that has leached veils of reddish brown on the cube's top and sides, Bradshaw simply dripped water onto pyrite (she has also left larger outdoor pieces outside to let the rain do the trick).
Two of the show's most recent works are large paintings on gessoed linen on which the artist painted a background of silver, then drew outlines of branches and leaves with liver of sulfur to activate an ongoing chemical reaction. They have apparently changed even since being hung in the gallery.
The most perfect expression of Bradshaw's ability to conjure change and indeterminacy in this show, though, is its earliest work, Without Title (1969), which comprises two tarnished silver casts of the halves of a broken eggshell. It brings to mind Duchamp's erotic bronze (originally plaster) cast Feuilles de vigne femelle ("Female Fig Leaf"), Johns' painted cast-bronze Ale Cans (a play on Duchamp's ready-mades), and the new life of a dove.
Larry Becker Contemporary Art, 43 N. 2nd St., 11 a.m. to 5 p.m. Fridays and Saturdays. 215-925-5389 or www.artnet.com/lbecker.html. Through Nov. 17.
All over City Hall
City Hall has two shows this month and next. One, "West Collects - Philadelphia," is on the first floor, in the building's Office of Arts, Culture, and the Creative Economy; the other, "Dialogo 365: Carpe Diem: A Latin American Art Exhibition," is on the fifth.
"West Collects - Philadelphia" is the result of a partnership between City Hall and the West Collections, started 15 years ago by Al West, founder of the SEI financial services firm, and his daughter Paige West, with the mission of finding the most compelling contemporary art available here and abroad.
The show gathers the works of 10 Philadelphia-based artists whose works were acquired by the collection in 2012: Kim Alsbrooks, Astrid Bowlby, Tim Eads, Colette Fu, Joe Girandola, Kay Healy, Erin Murray, Tim Portlock, Brian Richmond, and Mark Stockton.
It's a nicely chosen, diverse group of artists whose works have been visible in shows here and elsewhere.
"Dialogo 365: Carpe Diem: A Latin American Art Exhibition," on the other hand, is a sprawling show consigned to a dimly lit hallway that should not have tried to be as all-inclusive as it is.
Of the works by the 31 artists who were selected by its curator Anabelle Rodriguez-Lawton to be in the exhibition, the ones that seem best able to overcome the limitations of the venue are Kukuli Velarde's freestanding ceramic figures; Tlisza Jaurique's small glitter paintings of skulls in fluorescent colors; Carlos Nunez's yellow metal "street signs" emblazoned with "Hope" and "Carpe Diem"; and Rafael Rosario Laguna's wooden medicine cabinet filled with amulets in pill bottles.
Art in City Hall, Philadelphia City Hall, Broad and Market Sts., 8 a.m. to 5 p.m. Mondays through Fridays; "West Collects - Philadelphia" closes Feb. 22, 2013; "Carpe Diem" closes Dec. 7. 215-686-9912 or firstname.lastname@example.org