Nam Man Prai (น้ำมันพราย, often translated as "spirit oil" or "corpse oil") is a substance described in Thai occult folklore (saiyasat) as a liquid or balm associated with the spirits of the dead and used in traditional stories as a love philtre (ya sanae) or hexing medium [1] [3] [4]. In classical ethnography—most notably Francis Henry Giles's (Phraya Indramontri Srichandrakumara) paper in the Journal of the Siam Society in 1937–1938—the term refers to fluid purportedly rendered by a spirit doctor (mo phi) from the chin or forehead of a corpse, especially a woman who died in childbirth (phi tai thang klom) or a person who died violently (phi tai hong), as well as herbal and beeswax compounds boiled over ritual fires [1] [3] [5].
Across Southeast Asia—where readers search for what is nam man prai in English, dầu nam man prai in Vietnamese, or apa itu nam man prai in Indonesian and Malay (alongside minyak dagu, "chin oil")—the subject spans three domains [5] [13] [19]. First is the historical and anthropological record of Tai folk belief regarding unnatural death [1] [5] [6]. Second is modern popular media, where the nam man prai movie and television genre—including the 2001 anthology Phi Sam Baht (Bangkok Haunted) and Dulyasit Niyomgul's 2014 feature SPELL (Nam Man Prai 3D)—depicts the oil as a cautionary horror trope [10] [11] [13] [14]. Third is criminal law and consumer fraud enforcement, under which corpse desecration is prosecuted under Title 13 (Sections 366/1–366/4) and Section 199 of the Thai Criminal Code, while commercial vials sold online are documented by police and commentators as herbal or synthetic imitations [3] [15] [16] [18] [19].
Key facts
| Aspect | Documented detail | Source |
|---|---|---|
| Thai script and literal meaning | น้ำมันพราย (nam man prai): nam man ("oil") + prai / phrai ("spirit" of water, trees, or childbirth death) | [1] [6] [8] |
| Regional terms | English: spirit oil, corpse oil; Vietnamese: dầu nam man prai; Malay/Indonesian: minyak dagu, apa itu nam man prai | [1] [5] [19] |
| Primary ethnographic source | Francis H. Giles (Phraya Indramontri), "About a Love Philtre, Known to the Siamese as Nam Man Prai—Spirit Oil", Journal of the Siam Society, Vol. 30, Pt. 1, pp. 25–28 (issue August 1937; bound volume / offprint 1938) | [1] [2] [3] [4] |
| Associated spirit categories | Phi tai thang klom (ผีตายทั้งกลม, woman dying with unborn child) and phi tai hong (ผีตายโหง, sudden violent death) | [1] [3] [6] [9] |
| Notable film and TV depictions | Phi Sam Baht / Bangkok Haunted (2001, "Nam Man Prai"); SPELL / Nam Man Prai 3D (2014); Winyan Phisawong (2019) | [10] [11] [12] [13] [14] |
| Thai statutory provisions | Thai Criminal Code Section 366/3 (damaging or moving a corpse or part of a corpse: up to 3 years prison or 60,000 baht fine), Section 366/4, and Section 199 | [15] [16] |
What Is Nam Man Prai? Etymology and Spirit Taxonomy
To understand what is nam man prai, scholars examine the compound's two Thai elements: nam man (น้ำมัน), meaning oil or liquid fat, and prai or phrai (พราย), a spirit category in Thai and Tai folklore [1] [6] [8].
Meanings of Phi Phrai and Phi Tai Thang Klom
According to Thailand's Royal Society (Orst) reference notes cited on Thai Wikipedia and Phraya Anuman Rajadhon's folkloric studies, phi phrai (ผีพราย) covers two primary concepts [6] [7] [8]:
- Female spirits of trees, water, and childbirth: In central Thai usage, phi phrai refers to luminous water spirits or female spirits linked to trees (Nang Phrai Tani in banana groves and Phrai Takhian in Hopea odorata trees) and women who die during pregnancy or childbirth (phi phrai tai thang klom) [6] [7] [8]. In Khun Chang Khun Phaen, hong phrai (โหงพราย) designates spirits of the dead summoned by ritualists [5] [8]. In Northern Thai (Lanna) belief, prai also describes a spirit that drains vitality from a living host, while Tai Dam and Tai Khao communities in Vietnam use the cognate phi pai (ผีปาย) for childbirth spirits [8] [9].
- Etymology of Tai Thang Klom: As Royal Society notes by Saengchan Saensupha explain, tai thang klom (ตายทั้งกลม)—often misspelled tai thong klom ("dying with a round belly")—derives from the Old Khmer and Sukhothai phrase thang klom (ทงงกลํ), attested in Sukhothai Inscription 1 with the meaning "entirely" or "all together," because both mother and unborn child perish together [9].
In Thai folk belief, both phi tai thang klom and phi tai hong (ผีตายโหง, people dying suddenly from accidents, murder, drowning, or childbirth) were thought to retain unspent life force [1] [3] [6] [9]. As Justin Thomas McDaniel notes in the Kyoto Review of Southeast Asia (2012), whereas ordinary Buddhist deaths are followed by cremation, victims of unnatural death were historically bound with sacred cord (sai sin), sealed at the eyes, nose, ears, and mouth with wax, and buried immediately to restrain restless spirits [5].
Regional Equivalents in Southeast Asia
Interest in the motif spans neighboring languages, including dầu nam man prai in Vietnamese ("Nam Man Prai oil") and apa itu nam man prai ("what is Nam Man Prai") in Indonesian and Malay. In Malaysia and Indonesia, the closest folkloric counterpart is minyak dagu ("chin oil"), which Malay press reports such as mStar link to stories of Siamese bomoh (ritualists), candle-heating of a corpse's chin, and grave vigils [19].
Francis H. Giles and the 1937–1938 Journal of the Siam Society Account
The foundational English ethnographic account of nam man prai was written by Francis Henry Giles (1879–1951), a British official under King Chulalongkorn (Rama V) who served as first Director-General of the Siamese Revenue/Excise administration with the noble title Phraya Indramontri Srichandrakumara (พระยาอินทรมนตรีศรีจันทรกุมาร) and as President of the Siam Society [1] [3] [4]. His four-page article, "About a Love Philtre, Known to the Siamese as Nam Man Prai—Spirit Oil", was translated into Thai by Sanchawi Saibua in the 25 February 1973 cremation volume for Luang Sawatdisarasastraputthi (Sawat Sumitra) at Wat That Thong [3] [4].
Note on the 1937 vs. 1938 Publication Date
Secondary literature cites Giles's paper under both 1937 and 1938, reflecting how Volume 30 of the Journal of the Siam Society (JSS) was issued and bound [1] [2] [3] [4] [5]:
- August 1937 (Issue Date): Wipha Jiraphaphaisan in Silpa Wattanatham (Silpa-Mag, 2023/2024), Rome Bunnag in MGR Online (2019), and Justin Thomas McDaniel in the Kyoto Review (2012) cite August 1937, when JSS Volume 30, Part 1 (pages 25–28) was issued (Bunnag's column misprints "Volume 10" for Volume 30 while preserving the August 1937 date) [3] [4] [5].
- 1938 (Bound Volume and Offprint Date): The digitized offprint on English Wikisource (
Index:Love Philtre (Giles, 1938).pdf, pages 25–28) carries the year 1938, matching the completed bound Volume 30 (1937–1938), which also included Giles's monograph "The Koh Lak Tradition" [1] [2].
Giles opened by linking nam man prai to "The Koh Lak Tradition", in which a Chinese prince named Prince Muak received a love philtre of wax, powder, and sandalwood oil from his grandfather's spirit to win Yom Doey, daughter of Prince Mawng Lai [1] [3] [4].
The Three Folkloric Methods Recorded by Giles
Giles recorded three folkloric methods described by local informants [1] [3]:
- First Method (Trance Invocation at the Grave): At a fresh grave of a pregnant woman (tai thang klom) or violent-death victim (tai hong), the mo phi arrived at night with two assistants, digging tools, a ritual knife, an inscribed cane (mai taphot), sacred cord (sai sin), eight directional yantra cloths, holy water (nam mon), charmed rice, one baht-weight (about 15.2 grams) of beeswax, and a nine-thread "Candle of Victory" (thian chai) [1] [3] [4]. Inside the cord enclosure, he summoned the spirit—said to rise as tall as a palm tree until pelted with charmed rice—and held the lighted thian chai beneath its forehead or chin to collect fluid before touching its elbows to release its grip [1] [3] [4].
- Second Method (Uncovering the Upper Corpse): Assistants dug down to the upper corpse, tied it upright to a stake, removed the wax face-mask, and held a candle beneath the forehead or chin [1] [3] [4]. Folklore claimed the spirit resisted by making diggers encounter only its feet, dragging a digger into the pit until beaten with the cane, or vanishing until recalled with incantations, holy water, and charmed rice [1] [3] [4].
- Third Method (Boiling Corpse Wax Over Three Skulls): The practitioner placed the wax face-mask from an unnatural-death corpse into a pot with oil and herbs, set it on three skulls at a three-way crossroads (thang sam phraeng) inside a sacred-cord boundary, and boiled it over three kinds of yantra-inscribed firewood while holding the Candle of Victory [1] [3] [4]. Apparitions above the skulls signaled completion, though tradition deemed it weaker than grave-drawn fluid [1] [3] [4].
Storage, Offerings, and Folkloric Warnings of Backlash
Folklore portrayed nam man prai as perilous to both practitioner and victim [1] [3] [4]. Sealed in a small vessel under yantra cloth inside a clay pot (mo din) on a shelf above head height, it required offerings of rice with fish or meat twice daily [1] [3] [4]. If neglected, the spirit was believed to devour the practitioner's entrails—summed up in the Thai proverb recorded by Giles: "Mo phi tai phro phi, mo ngu tai phro ngu" ("The spirit doctor dies by the hand of a spirit, the snake charmer by the poison of a snake") [1] [3] [4]. Applied by touching, flicking (dit), or mixing into food or drink, the potion was said to leave female victims paralyzed and short-lived, or cause male-corpse spirits to possess victims so violently that exorcists fled [1] [3] [4].
McDaniel (2012) noted that stories of nam man prai and kuman thong circulated alongside Bangkok cemetery exhumations by Teochiu benevolent societies such as the Poh Teck Tung Foundation (founded 1909) and Buddhist asubhakammatthana (corpse-contemplation) practices [5]. Malaysia's mStar (2025) similarly recorded the Siamese folk memory that bereaved families guarded the grave of a pregnant woman for 44 days so the body could not be disturbed [19].
Depiction in Thai Cinema and Television
As Phraya Anuman Rajadhon observed, modern Thai cinema and television standardized the visual imagery of folk ghosts and rituals [6] [7]. In the nam man prai movie subgenre, the oil serves as a moral cautionary tale about obsession and karmic retribution [10] [11] [13] [14].
Phi Sam Baht / Bangkok Haunted (2001)
The best-known film depiction appeared in Phi Sam Baht (ผีสามบาท, Bangkok Haunted), a 130-minute horror anthology produced by Avant (RS Film) and released in Thailand on 21 December 2001 (UK DVD 24 March 2003; US DVD 26 July 2005) [10] [11] [12]. Adapted from short stories by Manas Janyong and written by Pisut Praesangeam and Sompop Phukphannoi, it was co-directed by Pisut Praesangeam and Oxide Pang Chun across three segments [10] [11] [12]:
- "Thon Khaen Nang Ram" ("Legend of the Drum"): Starring Pimsiree Pimsee and Pramote Seangsorn, concerning a 70-year-old antique drum made from a dancer's skin and arm [10] [11] [12].
- "Nam Man Prai" ("Black Magic Woman"): Directed by Pisut Praesangeam and starring Dawan Singha-wee as Pan, a lonely 25-year-old (wai benchaphet) Bangkok woman who uses mortuary-extracted nam man prai ("Ply Essence" in English subtitles) like perfume to seduce a man named Tim, culminating in Tim's axe-wielding corpse burying Pan alive with him in a coffin [10] [11] [12].
- "Chong Wen" ("Revenge"): Directed by Oxide Pang, starring Pete Thong-Jeur and Kalyanut Sriboonrueng in an investigation of a staged hanging [10] [11] [12].
Phi Sam Baht grossed roughly 90 million baht, becoming the first modern Thai horror anthology and the second-highest-grossing Thai horror film of its era after Nang Nak (1999) [10] [11].
SPELL / Nam Man Prai 3D (2014) and Television Dramas
On 11 September 2014, director Dulyasit Niyomgul released SPELL (สเปลล์ น้ำมันพราย, or Nam Man Prai 3D), starring Wanida Termthanaporn ("Gypsy"), Matthew Deane Chanthavanij, and Patchuda Panphiphat [13]. On television, Channel 8's Winyan Phisawong (วิญญาณพิศวง) aired its "Nam Man Prai" episode on 6 July 2019 (starring Due Arisara Thongborisut and Kit Krit Amornchairerk), portraying a woman who flicks nam man prai onto a married man and suffers a life-threatening miscarriage when the spell rebounds (khong khao tua) [14].
Legal and Ethical Issues: Thai Criminal Law and Consumer Fraud
In contemporary Thailand, extracting or trading human remains is a criminal offence [3] [15] [16] [17] [18].
Statutory Offences Under the Thai Criminal Code
Two sections of the Thai Criminal Code (ประมวลกฎหมายอาญา) govern corpses and human remains [15] [16]:
- Title 13: Offences Relating to Corpses (Sections 366/1–366/4): Added by the Criminal Code Amendment Act (No. 22) B.E. 2558 (2015), Section 366/3 penalizes anyone who, without reasonable cause, damages, moves, destroys, or takes a corpse, part of a corpse (suan khong sop), bone relics (atthi), or ashes with up to three years imprisonment, a fine up to 60,000 baht, or both [15]. Section 366/4 penalizes insulting a corpse (up to three months prison or 5,000 baht fine), while Sections 366/1–366/2 penalize sexual and indecent acts upon a corpse [15].
- Section 199 (Concealing, Moving, or Destroying a Corpse): Amended in B.E. 2560 (2017), Section 199 penalizes stealthily burying, concealing, moving, or destroying a corpse or part of a corpse to hide a birth, death, or cause of death with up to one year imprisonment, a fine up to 20,000 baht, or both, alongside cemetery theft charges [16] [17].
Police Enforcement and Fake Commercial "Corpse Oil"
Thai police and press reports document both prosecutions for grave desecration and widespread commercial fakery [3] [17] [18] [19]. A former novice monk in central Thailand filmed roasting an infant corpse in the 1990s recounted in a February 2019 interview reported by MGR Online that he served three prison terms—roughly six months for moving and destroying a corpse, nine years and nine months for public fraud, and two years and six months for money laundering—and warned that corpse rituals violate Thai law and Buddhist precepts [20].
In April 2015, Provincial Police Region 5 inspected a lay samnak in Mae Taeng District, Chiang Mai, over online claims of nam man prai made from human organs; officers found only herbal oils and wooden rak-yom figures and shut down the website [18]. Conversely, in September 2015, Udon Thani police raided a house in Mueang Udon Thani after a skull was stolen from a Nam Som cemetery, arresting an apprentice and seizing bone fragments, ritual knives, and a pot used to prepare nam man prai and a skull forehead piece (panneng) ordered for 50,000 baht [17]. Commentators in Silpa Wattanatham (2024) and mStar (2025) note that inexpensive vials sold online as nam man prai contain no human remains, consisting instead of sandalwood oil (nam man chan), coconut oil, beeswax (si phueng), perfume, or herbal oils (nam man wan), while mainstream Thai Buddhism (Phutthasat) rejects corpse-manipulation rituals as contrary to Buddhist ethics [3] [5] [18] [19].
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