Title: The effectiveness of different makeups at same SPF level at blocking ultraviolet light in normal daily lives.
Group members participated in the experiment: Mathurra Siva, Julia Enriquez and Jindi Li
Introduction
Background information:
Ultraviolet (UV) light is electromagnetic waves which travel at a same speed of 300000000 m per seconds through the space from the sun. UV light is crucial for the human’s body as it helps people to produce vitamin D. However, excess of UV light without protections can lead to sunburn, skin irritates and even skin cancer, melanoma. Human’s skin naturally blocks the UV light by producing melanin, a type of chemical and pigment, in the body when exposed to UV light. Melanin is produced by melanocytes which …show more content…
The chemical ingredients for blocking UVB and UVA radiations in a sunscreen normally include zinc oxide, titanium dioxide, avobenzone, ecamsule, and oxybenzone (Wang, S 2015). Sunscreen protects skin by reflecting the UVB light when consisted of inorganic chemicals (including zinc oxide and titanium dioxide), or absorbing UVB light and then release as heat when consisted of organic chemicals (excluding zinc oxide and titanium dioxide) (Grifantini, K 2010). In other words, the skin would not be burnt by exposing to the UV light with the protection of sunscreens. However, most people do not use enough sunscreen to protect the skin. For example, most of the makeups contain a Sun Protection Factor (SPF) level of 15, which blocks approximately 93 percent of the UVB light (Grifantini, K 2010). The different makeups may not all have the same effect on blocking UV rays even though with the same SPF level. This is because makeups are normally relying on chemicals excluding zinc oxide and titanium dioxide, hence cannot protect skin against UV rays …show more content…
The UV sensitive beads would change colour immediately after exposed to the sun. A small colour change represents the makeup has good effective on blocking sun radiation. However, big colour change in the sensitive beads means the makeup does not block UV radiation effectively.
Aim:
This experiment is to investigate whether the same SPF level of sunscreen in different makeups would have similar effectiveness of blocking sun rays.
It is hypothesised that if the different types of sunscreens in makeups are changed, then the result of effectiveness of sunscreens for blocking UV rays will also be changed. This is because the ingredient in each makeup is different to compare with outers, hence having different protective levels of the sun.
Methods:
For all of the preparation before the experiment were done indoor. Firstly, five cleaned petri dishes were obtained, five samples of makeups included Vaseline, Nivea sun spray, Cien BB cream, Biocura, and Belo were all collected with each of 10ml. Ten UV sensitive beads, two paper boxes, a mobile phone and a stop watch were also obtained for this experiment. Finally, a pen and book were used for recording the
Group members participated in the experiment: Mathurra Siva, Julia Enriquez and Jindi Li
Introduction
Background information:
Ultraviolet (UV) light is electromagnetic waves which travel at a same speed of 300000000 m per seconds through the space from the sun. UV light is crucial for the human’s body as it helps people to produce vitamin D. However, excess of UV light without protections can lead to sunburn, skin irritates and even skin cancer, melanoma. Human’s skin naturally blocks the UV light by producing melanin, a type of chemical and pigment, in the body when exposed to UV light. Melanin is produced by melanocytes which …show more content…
The chemical ingredients for blocking UVB and UVA radiations in a sunscreen normally include zinc oxide, titanium dioxide, avobenzone, ecamsule, and oxybenzone (Wang, S 2015). Sunscreen protects skin by reflecting the UVB light when consisted of inorganic chemicals (including zinc oxide and titanium dioxide), or absorbing UVB light and then release as heat when consisted of organic chemicals (excluding zinc oxide and titanium dioxide) (Grifantini, K 2010). In other words, the skin would not be burnt by exposing to the UV light with the protection of sunscreens. However, most people do not use enough sunscreen to protect the skin. For example, most of the makeups contain a Sun Protection Factor (SPF) level of 15, which blocks approximately 93 percent of the UVB light (Grifantini, K 2010). The different makeups may not all have the same effect on blocking UV rays even though with the same SPF level. This is because makeups are normally relying on chemicals excluding zinc oxide and titanium dioxide, hence cannot protect skin against UV rays …show more content…
The UV sensitive beads would change colour immediately after exposed to the sun. A small colour change represents the makeup has good effective on blocking sun radiation. However, big colour change in the sensitive beads means the makeup does not block UV radiation effectively.
Aim:
This experiment is to investigate whether the same SPF level of sunscreen in different makeups would have similar effectiveness of blocking sun rays.
It is hypothesised that if the different types of sunscreens in makeups are changed, then the result of effectiveness of sunscreens for blocking UV rays will also be changed. This is because the ingredient in each makeup is different to compare with outers, hence having different protective levels of the sun.
Methods:
For all of the preparation before the experiment were done indoor. Firstly, five cleaned petri dishes were obtained, five samples of makeups included Vaseline, Nivea sun spray, Cien BB cream, Biocura, and Belo were all collected with each of 10ml. Ten UV sensitive beads, two paper boxes, a mobile phone and a stop watch were also obtained for this experiment. Finally, a pen and book were used for recording the