The PH Levels in the soil where i buried the film would have affect colours,etc as seen on the chart.
http://www.terragis.bees.unsw.edu.au/terraGIS_soil/images/soil_prop_chemistry_pH.jpg&imgrefurl=http://www.terragis.bees.unsw.edu.au/terraGIS_soil/sp_soil_reaction_ph.html&h=363&w=350&sz=28&hl=en&start=3&http://www.terragis.bees.unsw.edu.au/terraGIS_soil/sp_soil_reaction_ph.html
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