• Journal of Digital Convergence
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• v.17 no.1
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• pp.357-364
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• 2019

This study comparatively analyzed hair damage by hair bleach particles and identified three different bleach particle sizes using a scanning electron microscope (SEM). The powdered bleaching agents made of ammonium persulfate (APS) and potassium persulfate had particle sizes of $131{\mu}m$, $72{\mu}m$ and $48.8{\mu}m$. According to a hair damage test, cuticle lift-up or peeling hardly occurred when small bleach particles were used. In terms of hair color, the hair bleached with larger bleach particles was the darkest, while the hair bleached with small bleach particles was the brightest. The results found that for bleaching agents that are more effective in easing hair damage, those with little particles should be used. In addition, it appears that the selection of particles depending on the degree of hair bleaching would enhance bleaching effects and reduce hair damage. The above process is a way to get great results in selecting a bleaching agent. It is anticipated that hair damage could be reduced during hair bleaching based on the above results.

• 한국패션뷰티학회:학술대회논문집
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• 2004.11a
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• pp.29-30
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• 2004

• Journal of the Korean Society of Fashion and Beauty
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• v.2 no.3 s.3
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• pp.68-73
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• 2004

The purpose of this study was to review the changes of hair colors by means of powder decolorant and oxidizers. For this purpose, a questionnaire survey on uses of powder decolorant and oxidizers was conducted, and the collected data thereby were analyzed. This study was concluded as follows; First, it was confirmed that when the hydrogen peroxide was used alone, the hair color was not changed however its concentration was high. Second, when powder decolorant and hydrogen peroxide were mixed at the ratio of 1:2, it was found that the higher the concentration of hydrogen peroxide was, hair color was changed more. Third, it was confirmed that the hair color became brighter when hairs were decolored three times serially. Fourth, it was found that hairs became tougher when the concentration of hydrogen peroxide was higher and when hairs were decolored many times serially.

• Korean Journal of Food Science and Technology
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• v.26 no.6
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• pp.787-790
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• 1994

An effective process manufacturing the decolorized chitin with high quality was established using shrimp shell powder. Ash and protein in shrimp shell powder were efficiently removed by 1.66% HCl and 3% NaOH treatments, respectively. A bleached chitin could be also obtained by 0.16% NaClO for 30 minutes, the treatment of which was much better than previously reported decolorization methods such as ethanol, acetone and $H_2O_2$ treatments. Since the pattern of IR spectrum of sample chitin was closely similar to those of commercially available chitins and the degree of deacetylation showed low value of 22.8%, it could be concluded that the bleached chitin obtained had highly-purified character as well as high quality of appearance.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.23 no.2
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• pp.77-86
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• 1990

The residue after hot water extraction of blue crab, Portunus trituberculata, was hydrolyzed for utilizing the byproducts as seasonings. The acid(5N HCl) hydrolyzates were then neutralized with $Na_2CO_3$, 5N NaOH or 5N NaOH hydrolyzate, while the alkali hydrolyzates (5N NaOH) were also neutralized with 5N HCl or 5N HCl hydrolyzate. The total nitrogen and formol nitrogen contents increased, and the platability of the hydrolyzates was also enhanced by neutralization. The released amino acid contents from the neutralized hydrolyzates with $Na_2CO_3$, 5N NaOH and 5N NaOH hydrolyzate were $2,274mg\%,\;2,105.0mg\%$ and $2,683.5mg\%$, respectively. Amino acid contents from the neutralized hydrolyzates with 5N HCl and 5N HCl hydrolyzate were $1,352.5mg\%$ and $2,498.8mg\%$, respectively. In the decolorization of hydrolyzates using decolorization agent, powdered active carbon showed good decolorizing effect. Powdered active carbon decreased total nitrogen and formol nitrogen contents in direct relationship to the increase in its concentration. The effective concentration of active carbon used as decolorization agent showed as $1\~2\%$ of the crab hydrolyzate. Salt contents could be decreased at 37 brix by desalination method such as the evaporation of the hydrolyzate contents.