You will need about a dozen 50cm lengths of kelp for this step. Pile your kelp so that air can flow into the pile. This will help with evaporation and speed up the process.
Be careful as you procure the 20 volume hydrogen peroxide. Many health and beauty stores that stock different volumes of hydrogen peroxide do so for dying hair. These hydrogen peroxide solutions may not be pure, and they may contain conditioners in addition to the hydrogen peroxide.
There is no need to heat the solution. The evaporation will take place properly at room temperature.
Do not use povidone iodine for this extraction. Extracting iodine from povidone iodine requires a different procedure than discussed in this method.
Distilled water is a type of purified water. Distilled water can be used as well.
Muriatic acid found in hardware stores is about 30% hydrochloric acid. This will work for this method of iodine extraction.
You will see iodine crystals begin forming within the solution and settling on the bottom. Wait until there are few to no new crystals forming before filtering.
