Even though the incremental concentration remains within acceptable bounds, it is advisable to resort to hot water during singeing processes when necessary. This precautionary measure not only aids in further reducing trace metal content but also aligns with national economic imperatives, ensuring that hides and skins can be utilized effectively within the leather industry. This recommendation underscores a balance between environmental and economic considerations, emphasizing the significance of employing appropriate techniques to uphold both regulatory compliance and industrial viability. The data elucidated in Tables and underscores the intricate dynamics surrounding trace metal contributions from scrap car tires to hides and skins. While acknowledging the potential for elevation in trace metal content post-incineration, the efficacy of washing procedures in mitigating this effect is underscored. Ultimately, the recommendation to utilize hot water during singeing processes not only serves to further reduce trace metal concentrations but also underscores the broader national economic imperatives concerning the leather industry.