टङ्कण
Sodium tetraborate decahydrate, Na2B4O7·10H2O. Tankana bhasma is the puffed, dehydrated form.
Parthiva · mineral origin · Kshara / Sadharana rasa
SHODHANA — NO MINERAL DRAVYA IS USED RAW
Heated on a tava until it swells and dehydrates into a light white porous mass — that puffed form is tankana bhasma and is what is used, never the raw crystal.
TRADITIONAL VIEW, WITH SAFETY LIMITS
Hindi name: Suhaga
What the texts say Tankana does
What the evidence says. Borax toxicology is well documented. Efficacy of the classical preparations is not established.
Side effects and limits
Boron compounds are reproductive toxins in animal studies and borax is restricted as a food additive in many countries. Acute ingestion of borax has caused poisoning, particularly in children.
Avoid or ask first: Pregnancy — it is an emmenagogue and boron is a reproductive toxin.; Children.; Renal impairment.
A traditional classification, not a recommendation. The full safety record is below.
AS THE CLASSICAL TEXTS AND THE API PRESCRIBE
| Bhasma | 125–500 mg |
| Anupana | Madhu · Ushnodaka |
| Kala | Adhobhakta |
A classical emmenagogue, which is exactly why it is contraindicated in pregnancy. Also the flux used in metal marana, which is a different use entirely.
Reported from Sharangadhara Samhita and the Ayurvedic Pharmacopoeia of India. Laisha states what the texts prescribe; it does not recommend. No quantity here is adjusted for a particular person — not for agni, koshtha, bala, age, pregnancy, kidney or liver function, or anything already being taken.
| Rasa | KatuTikta |
| Guna | RukshaLaghuTikshna |
| Virya | Ushna |
| Vipaka | Katu |
| Doshakarma | Kaphavatahara. |
| Upayukta anga | Tankana bhasma |
Tankana is classed among the Kshara / Sadharana rasa.
| English | Borax |
| Hindi | Suhaga |
| Kannada | Bilibiluve |
Rasa, guna, virya, vipaka and karma are recorded as the classical texts give them, with the text and section named so a student can open the book and check.
Industrial borax is the same compound and is not prepared as tankana bhasma. The puffing is the preparation.
Sodium tetraborate decahydrate, Na2B4O7·10H2O. Tankana bhasma is the puffed, dehydrated form.
A WAY TO REMEMBER IT
Tankana is from the Persian and Arabic tinkar, which is also where borax itself comes from through Latin. The word travelled the trade route with the mineral.
Tankana is used in kasa, shwasa and in gynaecological yogas, and as the flux in metal preparation.
Constituents. Sodium tetraborate decahydrate, Na2B4O7·10H2O. Tankana bhasma is the puffed, dehydrated form.
| Status | Borax toxicology is well documented. Efficacy of the classical preparations is not established. |
| The honest gap | Mineral and animal dravya are far less studied than plant dravya, and what study exists is chiefly characterisation and toxicology rather than clinical efficacy. |
Boron compounds are reproductive toxins in animal studies and borax is restricted as a food additive in many countries. Acute ingestion of borax has caused poisoning, particularly in children.
| Contraindications | Pregnancy — it is an emmenagogue and boron is a reproductive toxin. Children. Renal impairment. |
| Interactions | No specific drug interaction is documented. Boron's handling is renal, so renal impairment prolongs it. Riboflavin — borate forms a complex with it and increases its excretion. |
| Pregnancy and breastfeeding | Absolutely contraindicated. |