1. F.2A Group 4

2. There are many chemicals in the printing ink. We divide them into five groups: Alcohol Isopropanol, etc. Organic solvent Toluene, trichloroethylene, perchlorcethylene, ethylene glycol, etc. Resin Acrylic resin, epoxy resin, etc. Dyes Aniline, toluidine, azo dyes, etc. Others Oxalic acid, plasticizer, wax, etc.

3. Some of the chemicals have bad effect to our body. They will affect our health through 3 ways : 1. Touch the printing ink for a long time 2. Swallow the ink carelessly 3. Smell the ink for a long time (only printing technician)

4. The main impacts are… Stimulate the skin Stimulate the respiratory tract Damage the central nervous system Damage the liver They may cause… Paralysis Pulmonary edema

5. Less ink comes outMore ink comes out

6. Materials and apparatus: Newspapers Sing Tao Daily Ming Pao am730 Headline Daily Student Standard The Standard Title: The level of the printing ink

7. Here are the materials and apparatus(left) Materials Pieces of tissue Cotton sheet Pieces of paper

8. Procedure: 1.Choose the black area of the newspaper. 2.Use a piece of tissue/cotton/paper to rub on the black area five times by using the same strength. 3.The result of the tissues is shown below:

9. The result of the cottons is shown below:

10. The result of the papers is shown below: Conclusion:The ink of Sing Tao Daily and Ming Pao goes out from the newspaper difficultly. The ink of Student Standard and am730 goes out from the newspaper easily.

11. Title: The newspapers in the soapy water Materials and apparatus: 1.Those six kinds of newspaper 2. A large amount of water 3. A bottle of foaming soap 4. A chopstick Here are the materials and apparatus:

12. 2. Put the newspaper (the size is about 37.5cm x 29cm) into it. Procedure: 1. Put about 700 ml tap water into the basin and add two big drops of foaming soap.

13. 3. Stir it with a chopstick for 1 minute. 4. The result is shown: (right)

14. Failed! Conclusion: The results of six kinds of newspaper are the same. We can just see that the water becomes dirty. The result of the experiment is not clear. So this experiment is failed…..

15. Title: The newspapers in the alcohol Materials and apparatus: 1. 100ml alcohol (70%)2. Those six kinds of newspaper 3. Six small trays4. A pair of scissors (for cutting) 5. A ruler (for measuring) 6. Dropper Procedure: 1. Cut out the suitable area of the newspaper. ( One side is all black. The other side is only words. The size is 3cm x 3cm ) Put it into a small tray.

16. The newspaper become translucent ! The colour of alcohol will change into purple or pink ! We will make a scale for the colour changing of the alcohol after the ink dissolves in it… Less ink dissolves in itMore ink dissolves in it

17. 2. Add 5ml alcohol into the small tray with a dropper. 3. After 2 minutes, the result is below:

18. The levels of different printing ink are shown below: Conclusion: The ink of Student Standard and AM730 dissolves in the alcohol easily. The ink of Ming Pao dissolves in the alcohol difficultly.

19. Through this project, we can tell the students that : The chemicals in the printing ink can affect our body health. When you are reading Student Standard and am730,be more careful. After reading newspaper, we must wash our hands. Then, we can read the newspapers more healthily.

20. References: 1.http://www.iosh.gov.tw/data/f2/sp64-4.htm 2.Wikipedia There maybe different chemicals in different newspapers,but we can’t find them out. We can only find the most common chemicals. We feel sorry about this.