Add to ORKG14C AMS analysis of occluded carbon in phytoliths (amorphous silica particles that form in and between living plants cells and are well preserved in soils and sediments) is a promising dating tool for paleoclimate and archaeological studies. In order to assess the accuracy of this method, different tests have been recently carried out on large phytolith-occluded carbon samples extracted from soils and harvested plants, in association with blank samples of SiO2 powder to check the absence of carbon contamination during the treatments. Despite this precaution, 14C values from recent harvested plants were inexplicably old (Santos et al. 2010). Nevertheless, we noticed that chemical extraction protocols that were used did not lead to samples to...