{"686122":{"#nid":"686122","#data":{"type":"news","title":"Blood, Brick and Legend: The Chemistry of Dracula\u2019s Castle","body":[{"value":"\u003Cp\u003EBy:\u003Cem\u003E \u003C\/em\u003EJosh Davies-Jones, Stephan Turano, Eric Zhang, Kalya Chuong\u003C\/p\u003E\u003Cp\u003EAt the \u003Ca href=\u0022https:\/\/matter-systems.gatech.edu\/mcf\/materials-characterization-facility\u0022\u003EMaterials Characterization Facility\u003C\/a\u003E in the \u003Ca href=\u0022https:\/\/matter-systems.gatech.edu\/\u0022\u003EInstitute of Matter and Systems\u003C\/a\u003E, we\u2019re not only probing modern materials. This week, we\u2019ve been studying the materials chemistry of the building blocks of the past.\u003C\/p\u003E\u003Cp\u003EOur latest project focuses on a fragment of history: part of the stone walls of Cetatea Poenari, the mountain citadel once home to Vlad III of Wallachia\u2014 better known to the world as Vlad the Impaler\u2014and the enduring inspiration for the world\u2019s most famous vampire, Dracula.\u003C\/p\u003E\u003Cp\u003EPoenari Citadel is an imposing ruin of stone and mortar perched high in the Carpathian Mountains. In the mid-1400s, it was ruled by Vlad \u021aepe\u0219 III, the Prince of Wallachia. He was known as \u003Cem\u003EDr\u0103culea\u003C\/em\u003E \u2014 \u201cson of the dragon\u201d \u2014 a title inherited from his father, \u003Cem\u003EDracul\u003C\/em\u003E, a member of the Order of the Dragon, a knightly order sworn to defend Christendom.\u003C\/p\u003E\u003Cp\u003EVlad ruled during violent clashes with the Ottoman Empire and is still regarded as a national hero in modern Romania. But to his enemies, he was a despot and a bloodthirsty tyrant, infamous for his gruesome habit of impaling his foes.\u003C\/p\u003E\u003Cp\u003EWhile vampirism wasn\u2019t a concept tied to Vlad in the 1400s, stories of his horrific deeds spread rapidly across Europe. One such story came from a Franciscan monk named Brother Jacob, who survived one of Vlad\u2019s purges and fled westward to Germany.\u003C\/p\u003E\u003Cp\u003EThere, he met a famous poet and musician, Michael Beheim, who turned Jacob\u2019s testimony into what we\u2019d now call a bestselling single\u2014a ballad titled \u003Cem\u003E\u201cThe Story of a Bloodthirsty Madman Called Dracula of Wallachia.\u201d\u003C\/em\u003E Think of it as the 15th-century equivalent of a diss track, causing nearly as much fuss as a modern-day celebrity feud.\u003C\/p\u003E\u003Cp\u003EBeheim performed his chilling song across Europe, even before Emperor Frederick III of the Holy Roman Empire. And it was here, in his haunting verses, that the true myth of Dracula began:\u003C\/p\u003E\u003Cblockquote\u003E\u003Cp\u003EIt was his pleasure and gave him courage\u003Cbr\u003ETo see human blood flow;\u003Cbr\u003EAnd it was his custom\u003Cbr\u003ETo wash his hands in it\u003Cbr\u003EAs it was brought to the table.\u003C\/p\u003E\u003C\/blockquote\u003E\u003Cp\u003EFollowing the success of Beheim\u2019s poem, German printers began releasing illustrated broadsheets depicting Dracula\u2019s supposed atrocities\u2014most of them wildly exaggerated, but undeniably effective at capturing the public\u2019s imagination. These sensational pamphlets spread the image of Vlad as a blood-drinking monster across Europe.\u003C\/p\u003E\u003Cp\u003ECenturies later, Bram Stoker would draw from these same dark tales for his 1897 novel \u003Cem\u003EDracula\u003C\/em\u003E, transforming the brutal prince of Wallachia into the immortal vampire of Gothic fiction.\u003C\/p\u003E\u003Ch2\u003EThe Science\u003C\/h2\u003E\u003Cp\u003EUsing a combination of \u003Ca href=\u0022https:\/\/matter-systems.gatech.edu\/mcf\/capabilities\/x-ray-diffraction\u0022\u003EX-ray fluorescence (XRF)\u003C\/a\u003E and \u003Ca href=\u0022https:\/\/matter-systems.gatech.edu\/mcf\/capabilities\/scanning-electron-microscopy\u0022\u003Escanning electron microscopy\u003C\/a\u003E with energy dispersive spectroscopy (SEM-EDS), we examined the elemental and mineral composition of a medieval brick from Vlad the Impaler\u2019s 15th-century fortress at Poenari.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EBy analyzing the elemental makeup of these medieval walls, we can uncover clues about the materials, methods, and craftsmanship used to build them more than five centuries ago. Insights from these analyses can inform modern sustainable construction, guiding the design of materials and structures that could stand strong for another thousand years.\u003C\/p\u003E\u003Cp\u003EThe XRF data revealed a chemical fingerprint typical of clay bricks made from local Wallachian materials:\u003C\/p\u003E\u003Cul\u003E\u003Cli\u003ESi (\u224848%) \u2013 Silicon, the dominant element, reflecting silicate-rich clays and quartz sands\u003C\/li\u003E\u003Cli\u003EAl (\u224816%) \u2013 Aluminum, from aluminosilicate minerals such as feldspar and clay\u003C\/li\u003E\u003Cli\u003EFe (\u224812\u201315%) \u2013 Iron, from iron oxides, the source of the brick\u2019s deep red coloration\u003C\/li\u003E\u003Cli\u003ECa (\u22486\u20138%), K (\u22484\u20137%), Mg (\u22482\u20133%), Ti (\u22481\u20132%), Na (\u22481%), plus trace Zr, Mn, and Zn\u003C\/li\u003E\u003C\/ul\u003E\u003Cp\u003EThis composition aligns perfectly with the geology of the surrounding Carpathian Mountains and known masonry techniques of the time. The Arge\u0219 River, which flows beneath Poenari, drains crystalline rocks of the F\u0103g\u0103ra\u0219 Mountains. These rocks naturally yield zircon (ZrSiO\u2084) and ilmenite (FeTiO\u2083) grains into local river sands\u2014both of which can be seen speckled through the brick.\u003C\/p\u003E\u003Cp\u003EThese accessory minerals are highly stable, surviving firing temperatures well above 1,000 \u00b0C and cannot be formed through the brick making process. In the 15th century, hauling heavy bricks up a mountain was arduous enough; importing them from elsewhere would have been impractical. So, these minerals tell us they came from local rock and sand found around the castle.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe dominance of silicon, aluminum, and iron makes perfect sense for a medieval brick formed primarily from silicate clays. Iron oxides produced the red color, while silica provided the rigid skeletal framework.\u003C\/p\u003E\u003Cp\u003EThe presence of hematite confirms that the brick was fired in an oxidizing environment, typical of medieval \u003Cem\u003Eclamp kilns\u003C\/em\u003E. However, the survival of some untransformed clay minerals suggests that temperatures were moderate\u2014likely between 750\u2013900\u00b0C\u2014which is consistent with local masonry practices of the time.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;Well-sorted quartz grains indicate that the brickmakers deliberately chose or tempered their clay with sand to minimize shrinkage and cracking. Larger and smaller grains together point to naturally mixed alluvial clay, while uniform fine grains could indicate intentional sieving. Quartz, being chemically stable, remained largely unchanged through firing, forming the hard silica backbone that contributes to the brick\u2019s durability.\u003C\/p\u003E\u003Cp\u003ECalsium appears in the brick as part of several minerals. Most commonly, it occurs as calcite (CaCO\u2083), also known as lime or as gypsum (CaSO\u2084\u00b72H\u2082O). Both minerals may have formed or re-formed during the six centuries since Vlad the Impaler\u2019s time, as the brick weathered and interacted with its environment.\u003C\/p\u003E\u003Cp\u003EIn many medieval structures, lime-based mortar was used to bond the bricks together. Over time, moisture can draw dissolved lime into the brick\u2019s porous network, where it later crystallizes as calcite when exposed to air. Similarly, sulfur compounds from the atmosphere or from the mortar itself can react with calcium to form gypsum crystals.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe combined elemental and m data reveal a straightforward but powerful truth: the bricks of Poenari Citadel were crafted from the very earth beneath its cliffs. Local clays, river sands, and centuries of weathering come together to form the story of our bricks.\u003C\/p\u003E\u003Cp\u003EIn the end, this analysis shows that Poenari\u2019s strength comes not from myth or mystery, but from the local earth and the practical knowledge of its builders. These bricks aren\u2019t supernatural\u2014they\u2019re simply well made, well fired, and well suited to their environment. And that, in its own quiet way, is just as impressive.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EGeorgia Tech scientists explore the elemental makeup of a 15th-century brick to connect Dracula\u2019s legend with real-world materials science.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Georgia Tech scientists explore the elemental makeup of a 15th-century brick to connect Dracula\u2019s legend with real-world materials science."}],"uid":"35272","created_gmt":"2025-10-31 18:10:27","changed_gmt":"2025-11-03 17:12:26","author":"aneumeister3","boilerplate_text":"","field_publication":"","field_article_url":"","location":"Atlanta, GA","dateline":{"date":"2025-10-31T00:00:00-04:00","iso_date":"2025-10-31T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"678513":{"id":"678513","type":"image","title":"Dracula-Castle-1.png","body":null,"created":"1761937811","gmt_created":"2025-10-31 19:10:11","changed":"1761937811","gmt_changed":"2025-10-31 19:10:11","alt":"Dracula\u0027s Castle and a piece of the castle we did analysis on","file":{"fid":"262562","name":"Dracula-Castle-1.png","image_path":"\/sites\/default\/files\/2025\/10\/31\/Dracula-Castle-1.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/10\/31\/Dracula-Castle-1.png","mime":"image\/png","size":1136452,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/10\/31\/Dracula-Castle-1.png?itok=-YdLTAUW"}},"678511":{"id":"678511","type":"image","title":"dracula-3.png","body":null,"created":"1761937811","gmt_created":"2025-10-31 19:10:11","changed":"1761937811","gmt_changed":"2025-10-31 19:10:11","alt":"Elements under the microscope","file":{"fid":"262560","name":"dracula-3.png","image_path":"\/sites\/default\/files\/2025\/10\/31\/dracula-3.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/10\/31\/dracula-3.png","mime":"image\/png","size":1261791,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/10\/31\/dracula-3.png?itok=URgjVS1O"}},"678512":{"id":"678512","type":"image","title":"dracula-4.png","body":null,"created":"1761937811","gmt_created":"2025-10-31 19:10:11","changed":"1761937811","gmt_changed":"2025-10-31 19:10:11","alt":"materials analysis of the brick","file":{"fid":"262561","name":"dracula-4.png","image_path":"\/sites\/default\/files\/2025\/10\/31\/dracula-4.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/10\/31\/dracula-4.png","mime":"image\/png","size":1646050,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/10\/31\/dracula-4.png?itok=BCnfw3w8"}}},"media_ids":["678513","678511","678512"],"groups":[{"id":"660369","name":"Matter and Systems"}],"categories":[],"keywords":[{"id":"187915","name":"go-researchnews"}],"core_research_areas":[{"id":"193652","name":"Matter and Systems"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Ca href=\u0022mailto:amelia.neumeister@research.gatech.edu\u0022\u003EAmelia Neumeister\u003C\/a\u003E | Research Communications Program Manager\u003C\/p\u003E\u003Cp\u003EThe Institute for Matter and Systems\u003C\/p\u003E","format":"limited_html"}],"email":["amelia.neumeister@research.gatech.edu"],"slides":[],"orientation":[],"userdata":""}}}