// Definition
The transfer of unwanted chemicals from parchment paper into rosin during the heat-and-pressure extraction process, including silicone coatings, plasticizers, inks, and chromium compounds from quilon treatments.
// From the Episode
A major discussion topic in this chunk. Dr. Mark explained that parchment paper was never designed for cannabis rosin production, and that heat and pressure cause chemistry to happen, potentially leaching contaminants. He suggested testing before-and-after silicon content of parchment to quantify transfer. Pedro noted never reusing parchment that touches rosin bags, replacing after 2 minutes at 169 degrees. Fletch proposed that reducing press time (kinetics) would reduce leaching.