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Thursday, June 1 • 10:30am - 11:00am
(Objects) The use of medical chelating agents for the removal of iron stains from marble

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This study investigates the use of five different chelating agents and their efficacy both in the removal of iron stains as well as their physical and chemical effects on marble surfaces. The products tested are: ammonium citrate, cysteine, maltol, picolinic acid and thioglycolic acid. One group of samples cut from Colorado Yule were artificially stained with iron oxide while another group was left unstained. Each chelating agent was tested at two different pH values that were chosen through UV-visible spectroscopy. The samples were analyzed before cleaning and again afterwards. Colorimentry, glossimetry and laser profilometry readings were taken of all samples at each state of this study in order to establish a thorough understanding of how these chelating agents affect the physical properties of the marble surface and to quantify the effectiveness of the chelators in removing the iron stains. Surface readings of the pH values of the samples as well as FTIR spectra were also taken at each stage in order to gain a better understanding of the chemical effects that the chelating agents have on the marble surface. This study aimed to provide the data necessary to develop a treatment procedure for the removal of iron stains from historic marble that takes into consideration both the chelating agent's effect on the iron stain as well as on the marble substrate.

Speaker(s)
avatar for Anna Funke

Anna Funke

Materials Conservation Intern, NCPTT
Anna Funke graduated from the MSc in Conservation for Archaeology and Museums at the Institute of Archaeology at UCL in 2016. During her studies she completed an MA thesis on the conservation of taxidermy and an MSc thesis on the microbiological activity in PEG treatments of waterlogged... Read More →

Co-Author(s)
avatar for Mary F. Striegel, [Fellow]

Mary F. Striegel, [Fellow]

Chief of Materials Conservation, NCPTT
Mary F. Striegel is Chief of Materials Conservation at the National Center for Preservation Technology and Training. She heads up basic and applied research that focuses on evaluation of preservation treatments for preventing damage to cultural resources. She and her staff undertake... Read More →
avatar for Jason Church

Jason Church

Materials Conservator, National Center for Preservation Technology and Training (NCPTT)
Jason Church is a Materials Conservator in the Materials Conservation Program at the National Center for Preservation Technology and Training (NCPTT) in Natchitoches, LA. NCPTT is a research and training office of the National Park Service. Jason divides his time between original... Read More →
avatar for Leah Poole

Leah Poole

Summer Intern, NCPTT
Leah Poole was a summer intern in the Materials Conservation department with Jason Church at the NCPTT in 2014. Prior to starting graduate school at the University of Texas, she received an undergraduate degree in chemistry.
avatar for Martha Singer-[PA]

Martha Singer-[PA]

Chief Conservator, Material Whisperer
Martha Singer is the Director of Material Whisperer Consultation and Conservation Services, based in the New York City area. She specializes in modern and contemporary sculpture and objects. She has been working in conservation since 1991. Understanding materials, their working and... Read More →

Thursday June 1, 2017 10:30am - 11:00am
Crystal Ballroom B Lobby Level, West Tower

Attendees (156)