For Texture and Visual Effects:
* Sand: Adds grit and a rough, earthy texture.
* Gravel: Creates larger, more dramatic textural elements.
* Straw: Creates a rustic look and can help strengthen the clay.
* Fiber: Adds strength and unique visual patterns (e.g., hemp, linen, sisal).
* Paper: Adds texture and can create interesting layering effects (e.g., shredded paper, newspaper).
* Fabric scraps: Adds visual interest and can be used for surface decoration.
* Glitter: For a sparkly effect.
For Color and Pigmentation:
* Clay slip: A liquid form of clay that acts as a binder and adds color.
* Oxides: Natural mineral pigments (e.g., iron oxide, copper oxide) that create a wide range of colors.
* Underglazes: Colored glazes applied under the top glaze.
* Engobes: Colored slips used for decoration and surface treatment.
* Stains: Water-based pigments that create a durable color.
For Strength and Workability:
* Grog: Crushed fired clay that adds strength and prevents cracking.
* Water: Used to adjust the consistency of the clay.
* Additives: Depending on the type of clay, specific additives can be used to improve its workability or strength.
For Special Effects:
* Salt: Used in salt glazing to create a unique textured surface.
* Wood ash: Adds a unique, speckled surface to clay.
* Chemicals: Certain chemicals can be added to create interesting effects (e.g., vinegar, borax).
Things to Consider:
* Type of clay: Not all clays are compatible with all additives. Check your clay's specifications for compatibility.
* Desired effect: Think about what you want to achieve with the addition you are using.
* Experimentation: Don't be afraid to experiment with different combinations to find what works best for you.
It's always a good idea to do some research on the specific type of clay you are using and the effects of different additives before you begin. Have fun experimenting!