Fluorescein particles definitely are a better visualization tool for evaporation in a porous media. We have also reported similar research recently.

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Navneet Kumar

Link to another such observations is:

Poster Use of fluorescein dye to visualize evaporation within porous media

Tomas Weiss

Thank you for the figures of your very interesting articles, we will make sure to mention them the next time we publish relevant research. Unfortunately, we did not know about your papers when writing the recently published continuation of this poster Article Use of sodium fluorescein dye to visualize the vaporization ...

I'm including links to the two articles of yours for my co-authors:

Article Sustained high evaporation rates from porous media consistin...

Article Evaporation From Confined Porous Media Due to Controlled IR ...

Tomas Weiss Martin Slavík

We have studied a similar system using Fluorescein dye tool. Here we used vertical and horizontal stacks of different particle sizes. The results are quite interesting. Please look at our paper and share it with others. Thanks.

The article is available here: Article Evaporation From Layered Porous Medium in the Presence of In...

and here with DOI: 10.1029/2017WR021954