By C. Wayne Smith
Read Online or Download Archaeological Conservation Using Polymers: Practical Applications for Organic Artifact Stabilization (Texas A&M University Anthropology Series) PDF
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Extra resources for Archaeological Conservation Using Polymers: Practical Applications for Organic Artifact Stabilization (Texas A&M University Anthropology Series)
CT- has a maximum working time of hours. Once the artifact feels dry, remove it from the Ziploc bag and allow it to cure in fresh air for as long as possible. While the artifact can remain in catalyzation as long as desired, the ﬁnal stage of fresh air curing will allow ﬁnal curing and ensure that catalyst fumes dissipate. If the wood requires spot treatment to remove white particulate formed on the surfaces during catalyzation, use a soft cloth containing a few drops of CR-. Reprocessing and Stabilization of PEG-Treated Wood Re-treatment strategies have been of particular interest to conservators at the Archaeological Preservation Research Laboratory.
CT- is the best general-purpose catalyst for treating dried wood. After applying CT- and allowing it to sit on the surfaces of the wood for no more than two minutes, wipe thoroughly and quickly. Using the same procedures as noted for waterlogged wood, continue vapor deposition by placing the artifact into a Ziploc bag. Place a small 29 30 dish containing a few grams of CT- into the bag and seal it shut. The catalyzation process will continue for up to hours.
Water/acetone exchange will take several days, depending upon the artifact’s size and density. This phase of treatment cannot be hurried. Incomplete dehydration or dehydration carried out too quickly may damage the artifact. Vacuum-assisted dehydration for the ﬁnal acetone baths is often an eﬀective way to ensure complete dehydration. During dehydration, the vat containing the artifact in fresh acetone is placed into a vacuum chamber. Two gas traps, immersed in dry ice or liquid nitrogen, should be placed in-line between the vacuum chamber and the vacuum pump.