Here is the data for the second part of my comparison of the 0.09mm acetate film strip and the 0.11mm metal open-air design slit.
The first table shows the data points and error percentages for the absorption data for Eosin y in ethanol scan that was done today, 08/20/2016 and those that were done on 08/10/2016 with the 0.09mm slit.
http://publiclab.org/notes/dhaffnersr/08-20-2016/comparison-values-for-0-09mm-and-0-11mm-slit-width
Dave H