The "henna stone" myth

Airborne allergic contact dermatitis caused by a henna stone.

Henna stone is a lesser-known commercially available material used to obtain black henna paste (1). In some countries, including Turkey, local herb sellers sell it as ‘natural stone’, a so-called natural source for black henna. The stone has to be crushed into powder first, and then mixed with water, hydrogen peroxide and, sometimes, natural henna to obtain black henna paste for the purpose of ...

Dyspnea Associated with Henna Stone: A Rare Cause of Pediatric Tracheotomy.

Tracheotomy is one of the oldest surgical procedures, and it is a life-saving procedure to overcome upper airway obstructions. While congenital causes play an important role in pediatric tracheotomy indications, upper airway edema and obstruction due to anaphylaxis rarely require tracheotomy. Allergy can cause life-threatening acute edema by anaphylactic reactions in the respiratory tract. Henn...

Henna Tattoo: Temporary or Permanent?

Contact dermatitis with henna tattoo.

Allergic and irritant reactions to henna are rare. Para-phenylenediamine, which is sometimes added to obtain a dark, blackish henna, causes the majority of contact dermatitis reported related with tattoos. Allergic contact dermatitis due to temporary paint-on tattoo with black henna is described in two adolescents.

The Myth of 'the Myth of Hypercomputation'

ness and Approximations Thursday, June 9, 2011 Abstractness and Approximations • This rather absurd attack goes as followsness and Approximations • This rather absurd attack goes as follows Thursday, June 9, 2011 Abstractness and Approximations • This rather absurd attack goes as follows 1. Even Turing machines are abstract models that can’t be implemented fully.ness and Approximations • This r...