As a general guide: 1 liter = 1 gram
You may also refer to the chart beside, this chart does not consider the items inside the packing and the materials being used for packing; but it is a start and will give you an idea of what size silica gel / desiccant packs to use and how much silica gel / desiccant to buy for your purpose.
Want to make purchase? Buy silica gels here.
You can use silica gel to dry flowers. Silica gel is a type of desiccant which absorbs a ton of moisture. As such it is highly suitable to be used for this purpose.
Materials needed include your flowers, silica gel, and a container with an airtight lid.
To start, place one layer of silica gel at the bottom of the container. Add the flowers to the container and add on silica gels onto the top of the flowers as required. The silica gel will absorb all of the water from your flowers within a few days.
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