Laboratory Analysis Report: Enquete 81/01

This document consists of a cover letter and technical laboratory reports dated October 23, 1981, from the Laboratoire d'Analyses Physiques (LDP) to GEPAN (C.N.E.S.). The correspondence concerns the results of mass spectrometry analysis performed on two soil samples and associated black deposits, referenced under case number 81/01 and laboratory reference GK/AG 81-0477. The laboratory director, G. K., informs the recipient, Monsieur V, that the differences observed in the soil samples are considered insignificant and may be related to a phosphate and zinc-based primer. Regarding the black deposits found on the soil, the laboratory suggests they may consist of a carbon-black based paint. They propose that a future comparative analysis between these deposits and standard black paints used on the undercarriages of heavy machinery would be beneficial. The document includes detailed tables of elemental analysis results for the samples, as well as graphical representations of the findings. The laboratory provides standard observations regarding the limitations of their semi-quantitative analysis, noting that results are accurate to a factor of three and that certain elements may be over- or under-estimated due to the nature of the spectrometry process.