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Figure 10
Result of the experiment carried out in puzzle (8). The capillary rise of the water carries the coloured hydro­philic ink towards the top of the filter paper and dyes it. Only the part of the filter paper covered by the transparent hydro­phobic ink remains unaffected. The number sought becomes visible.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 56| Part 5| October 2023| Pages 1544-1556
https://doi.org/10.1107/S1600576723006714
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