Mold Making with Jello

Step 2 How Much "Stuff" do I Need?

This is very easy to determine.... But first, here's some rules for the positive.

1. No undercuts - that is, if the mold material goes over (or into) your positive - you won't be able to get it out (without some surgical maneuvers).
2. Avoid super fine detailing - I haven't experimented with this yet, but it seems like it would be bad.
3. Don't let the positive rest on the "floor" **

So how much gelatin do we need? Lets do a "dry" run.

First, place your positive into your vessel. Now, fill with water (you may need to hold your positive under). Next, remove the positive and measure how much water is left in the container (you'll probably be pouring off into a measuring cup).

You will need one 8oz serving package of Jello/gelatin for every 3/4 cups of water. I have not tried higher concentration (yet), but feel free to experiment as a less "jiggly" mold would be better.

** There is an exception to this rule. That is, if your positive has a flat side that doesn't matter (like the back side of a chocolate bar) - it is beneficial for that back side to rest on the "floor" of your vessel. This was the case for the Tetris Ice Cube Tray.