-We tried using the cardboard box as a enclosed dark container to test how much light can pass but the box had too many tears and holes, so we got a PVC pipe instead and used it instead as it is more accurate with the light much closer to the cloth.
2.1 Equipment List:
-[Complete Dynamo Anti-Bacterial] detergent
-[Vernier LabQuest 2] datalogger
-[Vernier] light sensor
-[Zebra Name Pen Fine] permanent marker
2.2 Diagrams of experimental setup
Figure 1.1: experiment set-up; the simulated single-light source environment is created with a sealed PVC pipe. There are two sections to the pipe, between them is the area which the fabric is placed. We ensured we zeroed the readings on the datalogger before each test in the same environment, for even higher precision and eliminating any unintentional effects of possible outside light interference.
1.Apply 70 strokes of permanent marker ink on 5 square centimetres of each respective fabric
2.Repeat [step 1] on the 54 pieces of fabric [6 x 3 (3 tests) = 18 pieces of polyester, 18 pieces of cotton, and 18 pieces of acetate]
3.Solute 1 millilitre of detergent into washing machine
4.Wash 3 fabrics of the different respective fabrics together, in 1500ml of water
5.Repeat [step 3] and [step 4] 3 times
6.Solute 2 millilitres of detergent into washing machine
7.Repeat [step 6] and [step 4] 3 times
8.Solute 3 millilitres of detergent into washing machine
9.Repeat [step 8] and [step 4] 3 times
10.Solute 4 millilitres of detergent into washing machine
11.Repeat [step 10] and [step 4] 3 times
12.Solute 5 millilitres of detergent into washing machine
13.Repeat [step 12] and [step 4] 3 times
14.Dry all washed fabrics under sunlight
15.Create test set-up as illustrated in the Figure
16.Test all washed fabrics
17.Test unwashed controls
18.Obtain results depicted on datalogger
19.Calculate the average results of the 3 similar tests of each respective detergent content, with each type of fabric
Figure 2.1: 5 square centimetre square on acetate, before shading
Figure 2.2: 5 square centimetre square on acetate, undergoing shading
Figure 2.3: preparation of experiment set-up (light sensor and dark environment)
Figure 2.4: set-up being utilised in experiment
Figure 2.5: preliminary washing with exceedingly high concentration of detergent resulted in a failed washing and leakage of washing solution, hence unusable results
2.4 Risk Assessment and Management
Detergent is dangerous if ingested and causes death.
Gloves must be worn when handling detergent, avoid eye and mouth contact
Permanent markers’ ink is dangerous for ingestion and scent might be toxic
Avoid facial contact with ink and never smell markers’ tip
Detergent spillage is inconvenient and might be a hazard
Ensure detergent packing is capped or sealed when not in use
Washing machines are dangerous if not handled properly
Ensure that an adult is supervising us when doing th experiment.
Exposure to direct light beam (especially high-powered) might cause blindness or eye injury
Refrain from pointing light source at face and ensure light source is turned off when not in use during experiment
2.5 Data Analysis
Type of Data
Vernier LabQuest 2 (datalogger)
Verner Light Sensor (lux meter)
Data will be measured in an environment where there is only a single light source, in this case, a PVC pipe with both ends covered, other than the sealed slot for the cable of the light and the external tube casing of the light sensor.
For the data to be consistent and reliable, one of the constant variables will have to be the luminosity of the test environment. We used the same power source for the LED light, for all of out tests. The PVC pipe body is ensured sealed completely, preventing outside light, before data is recorded.