3.
Results
3.1 Long-Term
Experiment
In the long-term
experiments, the bloodstain scans showed little variation between 1.5
hours and four weeks (Figure 1A). For the long-term experiments,
kurtosis values showed slight variation over the four weeks
(Supplemental S3), although the values were always less than three,
indicating platykurtic distributions, or height profiles with multiple
heights of similar frequencies. Skewness values showed similar timewise
fluctuations but were influenced by individual bloodstain variation. For
example, bloodstain 1 had overall negative skewness values, while
bloodstains 2 and 3 had positive skewness values. Surface roughness
slightly increased within the first day, but then plateaued over the
tested timeframe. Maximum height was measured from the horizontal and
vertical slices taken from the long-term bloodstains, where minimal
change was observed in the height profile over time, except for the
earlier time points (1.5 and 6 hours) which had lower heights at the
centre of the bloodstain.