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So, you've finished a crocheted item to which you want to add some stiffness. You might be tempted to use liquid starch, but I'd caution against it. First, liquid starch can attract and serves as a food for insects. Also, especially if the item is light in color, it will cause yellowing over time. Instead you might want to water down some regular glue (like Elmer's) or purchase a specific product labeled as a fabric stiffener (usually available in crafts stores). Rather than dipping your item into the stiffener, use a brush to "paint" the inside. That way, you don't have to worry about any discoloration or saturation.