Of the D and G bands, we discussed in SSRN and ChemRxiv, where we considered the decomposition of the Raman spectrum made by means of q-Gaussian functions. The q-Gaussians are probability distributions having their origin in the framework of Tsallis statistics. A continuous real parameter q is characterizing them so that, in the range 1 < q < 3, the q-functions pass from the usual Gaussian form, for q close to 1, to that of a heavy tailed distribution, at q close to 3. The value q=2 corresponds to the Cauchy-Lorentzian distribution. Among the experimental data investigated in SSRN and ChemRxiv , there are also those regarding biochar. Biochar (or simply char) is a substance obtained by heating organic material in a pyrolysis process. This process drives off volatile gases and liquids, leaving behind a stable carbon-rich solid material. Being the biochar suitable for many applications, and for this reason known as the "black gold", the existence of toxic of cancerogenic substances in it is requiring a specific investigation. In fact, the "black gold" possesses a "dark side" ). We will discuss this problematic aspect of biochar in a next work. In the Fig. , two examples of D-to-G Raman spectra of biochar are proposed. The decomposition was made by means of q-Gaussian functions. A third example of (bio)char D-to-G Raman spectrum we will show in the Figure , from data by Smith et al., 2016. Besides investigating the pyrene Raman spectrum, Smith and coworkers analyzed naphthalene, perylene, benzo[a]pyrene, benzo[g,h,i]perylene, coronene and anhydrous tetracarboxylic perylene, by means of simulations and experimental results. Accordingly, they proposed a structural analysis of char for the D-to-G Raman spectrum. The approach proposed by Smith et al. was that of starting from single elements, with specific defects, to argue their presence in the Raman bands of char. The researchers concluded for ten bands. "Based on simulation results, a total of ten potential bands have been assigned between 1000 cm -1 and 1800 cm -1 . These bands have been used to deconvolute a thermoseries of cellulose chars produced by pyrolysis at 300-700 °C" .