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. 2018 Feb 15;9(3):1151–1163. doi: 10.1364/BOE.9.001151

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Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Fig. 1 — Photographs of gel wax phantoms with different compositions. (a) Optically transparent native gel wax, prior to processing. (b) Native gel wax with TiO₂ added for optical scattering. (c) Native gel wax and TiO₂, with carbon black ink added for optical absorption. (d) The University College London (UCL) logo fabricated with inclusions that comprised TiO₂ and differently-coloured inks in a native gel wax background ( Visualization 1^{(6.7MB, mp4)}).