Question: Ammonium

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From an anonymous commentor comes this question…I read the following from your pdf on conditioners: The main conditioning agent in BTMS (behentrimonium methosulfate) is a cationic quaternary ammonium salt derived from rapeseed oil (the plant for canola oil).My questions are: Any of the shampoos that have ammonium sulfates in them totally wreck my hair. I...

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SPF – what exactly does that mean? (updated)

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What is sun protection factor or SPF? How is it defined? SPF is defined as… the dose of UV radiation required to produce 1 minimal erythema dose (MED) on protected skin after the application of 2 mg/cm2 of produce divided by the UV radiation to produce 1 MED on unprotected skin. In other words, it’s...

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Query: How do you know you’re sensitive or allergic to things?

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A question keeps popping into my head – how do we know we’re sensitive or allergic to something? I see comments by people all the time (not on this blog, but other forums) saying “I’m allergic to quaternium-15” or “I can’t use fill in the blank because I break out”, but I’m always curious –...

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Pigmented (P) or non-pigmented (N)

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We have arrived at our third skin type – pigmented or non-pigmented. This is defined by pigmentation on the face or chest, not by the colour of your skin. The key is that this hyperpigmentation is unwanted, and is generally caused by too much sun exposure. Melanogenesis is a defensive mechanism our skin uses to...

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Sensitive (S) skin type – allergic type

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The final type of sensitive skin types is the allergic type skin. This skin type exhibits redness, swelling, itching, and skin flaking when exposed to something to which the skin is allergic. Approximately 23% of women and 13.8% of men in Great Britain exhibit this skin type, and most of the reactions in personal care...

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