providence

Megan and I made a batch for testing the H2S strips last night. We made 66 strips in all. We could only make 1 batch as we ran out of drying space in the dark room. Some of the strips stuck together and had to be discarded. They are to be marked with red dots so we can compare strips made with this batch of Ilford paper with strips made from a second batch of Ilford paper. We hypothesize that the results will vary slightly between batches of Ilford paper depending on the quantity of Silver Halide in the paper.

The advantage of using the tent container is that it can be flat packed and shipped in an envelope and then sealed up at the end of the test and shipped back rather in expensively.

It is important to use heavy duty plastic in order to prevent light contamination, 2mil or great should be good. Here is a website to order the bags, only bad thing is you have to order a carton.

http://www.uline.com/Product/AdvSearchResult.aspx?keywords=black%20plast...

Container Test #2
4/1/2012-4/4/4/2012

Results: Designs 1, 2, 5 and 6 were effected least by light. The control was left out in the same location as other containers but in open light. It should be noted that fixing did not eliminate discoloration from light exposure.

Container Test #1
3/28/2012-4/4/4/2012

Results: Results showed that regardless of location the black VCR tape container were able to protect the photo paper from light exposure. The side that was open to the light was exposed, this was not corrected with by fixing.

Nowadays, I am trying to make a Small hamsterball.

Originally, wheels are for cars.

But in my project, the wheels function as support parts.

Focus of test is on residential ambient air from a fraction of a ppm to <100ppm

Considerations:

• H2S is highly soluble in water and water vapor in air
• Shortcoming of handheld instruments is that that do not
measure the H2S dissolved in water vapors. These tests
are especially inaccurate at exposure levels < 100ppm,
which are the levels of interest for this study.
• H2S is heavier than air and thus gathers in low places
• Specimens should not remain in the ambient air longer