<i>CrimsonCalc</i>: a software tool for pressure determination based on ruby fluorescence spectra

<i>CrimsonCalc</i> is open-source software for processing ruby fluorescence spectra and calculating pressure from the shift of the <i>R</i> ₁ peak. It supports processing and plotting of an individual spectrum as well as batch processing of spectra from data in text or Bruker <i>OPUS</i> binary format. Core features include baseline correction, pseudo-Voigt peak fitting, automated detection of detector saturation, and pressure calculation using user-defined or automatically detected reference spectra. The software provides batch output in both human-readable and machine-readable formats. With an intuitive graphical user interface, <i>CrimsonCalc</i> is designed as a high-pressure research aid and includes additional tools such as a diamond Raman edge pressure calculator, an interferometry-based gasket thickness calculator and an estimator for the upper pressure limit based on diamond anvil culet diameter. The program can be easily adopted in high-pressure research laboratories to facilitate pressure readings directly from simple text data, and to generate the images and result files that enable straightforward report preparation.