The study re-evaluates the Longin collagen-extraction method, suggesting that lower reflux temperatures reduce protein degradation and allow for additional purification through ultrafiltration to isolate the >30kDalton fraction of the reflux product. The modified method involves refluxing in a weak acid solution (0.01 N HCl) at 58°C, followed by ultrafiltration to separate larger peptides from contaminants. This modification improves the yield of larger peptides and reduces contamination, making the >30kD fraction more suitable for radiocarbon dating. The results show that the modified method provides more reliable 14C dates compared to the traditional Longin method.The study re-evaluates the Longin collagen-extraction method, suggesting that lower reflux temperatures reduce protein degradation and allow for additional purification through ultrafiltration to isolate the >30kDalton fraction of the reflux product. The modified method involves refluxing in a weak acid solution (0.01 N HCl) at 58°C, followed by ultrafiltration to separate larger peptides from contaminants. This modification improves the yield of larger peptides and reduces contamination, making the >30kD fraction more suitable for radiocarbon dating. The results show that the modified method provides more reliable 14C dates compared to the traditional Longin method.