Which index fluid concentration would be used to create a lower concentration diluted solution?

To create a lower concentration diluted solution, the correct choice is a 30 index fluid. In embalmers' terminology, the index of a solution refers to the percentage of formaldehyde present in that solution. A lower index value indicates a lower concentration of formaldehyde.

When preparing a diluted solution for embalming, one typically combines a higher index fluid with water or other solutions to achieve the desired concentration for the specific needs of the embalming process. In this context, using a 30 index fluid means you are starting with a solution that has a lower concentration compared to higher index fluids like 50 or 35. This makes it easier to create a diluted solution appropriate for a case requiring less preservation potency.

By contrast, the higher index options (like 50 index or 35 index) would result in higher concentrations of formaldehyde, which are not suitable for creating a low concentration solution. A 20 index option, while also lower than 30 index, is not typically utilized in many embalming practices, as it is considered too weak for effective preservation in most cases. Therefore, the choice of the 30 index fluid establishes a balance between efficacy and gentleness in the embalming process.