Molding and casting with alginate and Rockite was a messy yet rewarding process. To begin, I started by mixing alginate and water in a silicone cup in the appropriate ratio as per the instructions. This was 6.75 ounces of water and 1.5 ounces of alginate measured using a weighing scale. The alginate-water mixture was thoroughly mixed together until it formed to a yogurt-like consistency. At this point, I stuck my fingers in to create a negative space or “mold,” of my fingers. The resulting mold can be seen in Figure 1. Note that I had already poured and removed Rockite from the mold, hence it is messy.

After 5 minutes, the alginate became a jello-like consistency and I removed my fingers from it. Then, I mixed the Rockite according to the instructions. This was 10 grams of water and 35 grams of Rockite. After mixing these components in a separate silicone cup, I poured it into the holes of the alginate mold. I used the provided jig to insert screws into the Rockite as it dried so the finger could be a wall hook. This cured for 24 hours after which I removed the fingers.

I then took the fingers outside to spray paint them and allowed them to dry on the rack as shown in Figure 2.

The finished product is shown in Figure 3. Notably, some people may have used power tools outside over the weekend causing some dust to collect on the fingers as they were drying.

This was a very interesting and easy project to implement. Additionally, it was low-cost. Please see the cost summary below for reference.

Cost Summary 

Cost Type	Cost	Price	Source	Quantity	Total
Materials	Alginate	$1.25/Ounce	amazon.com	1.5 ounces	$1.875
	Rockite	$0.17/ Ounce	amazon.com	1.23 ounces	$0.2091
	Spray Paint	$0.50/Ounce	amazon.com	2 ounces	$1.00
	Screws	$0.05/Count	amazon.com	2 count	$0.10
	Silicone Cup	$2.4975/cup	amazon.com	2 cups	$4.995
Labor	Prototyping Engineer (You!)	free	me	1	$0
Total					$8.18