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Dear Mr. Schlesinger,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 2 files related to "silicone oil" in the 1940s-1950s that may be of interest to you. These records have been digitized and can be viewed in the Catalog.
We also located 76 files related to silicone in the 1940s and 1950s that may also be relevant to your research. Some of these records have been digitized and may be viewed in the Catalog. You may contact the reference unit listed in each Catalog description for additional assistance with these records.
You may also wish to use the Catalog to explore numerous records related to rationing in the Records of the Office of Price Administration (Record Group 188).
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from various NARA reference units. We apologize for this inconvenience and appreciate your understanding and patience.
Finally, you may also wish to research records related to the invention of Silly Putty. The SNAC (Social Networks and Archival Context) Cooperative, for example, lists 10 entries related to the Dow Corning Corporation and 1 entry for Earl L. Warrick, who is one of the potential inventors of SIlly Putty. Silly Putty is also a trademark of Crayola, LLC, and their archives or that of their predecessor Binney & Smith may also be able to assist you.
We hope this information is helpful, and best of luck with your research!
A very belated thank you for sharing these resources and introducing me to the NA catalog.