This is an awesome, easy-to-use, product that has the strength of resin but is as simple to work with as Play-doh!
When working with jewelry clay you need to wear some gloves and coat your work surface with some wax paper!
Also, powder your surface with some baby powder or cornstarch like you would for cookies.
Jewelry clay is a 2 part product that is mixed in a 1 to 1 ratio.
Take 1 part of A (the gray) and an equal amount of B (the white).
The best way I've found is by rolling them into balls and adding or subtracting until the balls are the same size.
Now knead the two balls together until you reach a uniform color. Once mixed you have up to 2 hours to work with the clay.
Here are the directions taken directly from ETI:
IMPORTANT: EnviroTex Jewelry Clay® performs best at temperatures between 70°F / 21°C and 80°F / 27°C. Both “A” and “B” components should feel slightly warm to the touch, if cool, stiff or hard, the clay can be warmed and softened by placing it in a sealed plastic bag, then set the bag into warm tap water for 5 to 10 minutes.
1. Wear vinyl or latex gloves to protect your hands. Tip: apply a very light coat of talc/baby powder, olive or vegetable oil to gloves after you have them on. This will prevent the clay from sticking to them, repeat as required.
2. Measure equal amounts of both “A” and “B” components. Form this material into balls equal in size.
3. Blend the two balls in your hands until there is a uniform color with no ribbons or marbling.
4. Working time, you have up to 2 hours working time. However, the longer you work with the clay, the more it will begin to set and harden.
5. Form and shape the clay as desired or place the clay into your bezel, then press and work it into all areas as needed. If free forming shapes, let the mixed clay set for 15 minutes before forming. This induction time helps the clay react within and hold its shape. You can also add talc or baby powder to the clay to help “stiffen” if necessary. Simply dust the clay with talc and work it in. Repeat this process until the clay reaches the consistency you require.
6. Within 5 hours of mixing, the clay will reach a soft cure and trim easily. After 24 hours you may need to use fine sandpaper to remove excess material.
7. Use warm water and liquid soap to remove from skin. NEVER USE SOLVENTS. Tools: While liquid, the material can be cleaned from tools with paper towels moistened with olive or vegetable oil. Rubbing alcohol can also be used. Once cured, sand or scrape material from tools.