Link to video 1 (chemical concept): https://drive.google.com/open?id=0B409415tuW64c2lGTW5jRVQ4NGs 

All images used in video 1 can be found in the “Introduction” and “Chemical concept” page of this blog.

 

Link to video 2 (application of concept): https://drive.google.com/open?id=0B3eZHxFjcYyPdEdOUV9ySm9raUE

Below are the references for images used in video 2:

 

Healthy Acid Mantle [A diagram showing the acid mantle of the skin and its ideal pH.]. (n.d.). Retrieved April 13, 2017, from http://www.activeskinprotection.com/education/acid-mantle/

 

[The skin’s protective acid mantle on a pH scale]. (2016, August 11). Retrieved April 13, 2017, from https://bellatory.com/hygiene-grooming/healthy-skin-the-ph-balance-of-popular-bar-soaps

 

[Diagram showing differences between normal skin barrier function and disrupted skin barrier function]. (2016, October 5). Retrieved April 13, 2017, from http://www.bondenavant.com/damaged-skin-barrier/

 

[Image showing various soap bottles]. (2012, December 15). Retrieved April 13, 2017, from http://www.care2.com/greenliving/hair-care-without-chemicals-2.html

 

[Image showing acne]. (2012, September 25). Retrieved April 13, 2017, from http://www.irishhealth.com/article.html?id=21105