The Benefits of Spectrophotometry for Clay and Terracotta Products
The color of terracotta and clay products can be influenced by a wide variety of factors. The traditional color of terracotta is orange, yet the material can also take on a red or brown hue if it’s left in the kiln for a long period of time. In order to get this trademark look, you need to use an effective color quality control process to ensure that each product is the perfect shade of burnt orange. However, many modern industries also choose to create terracotta and clay products that deviate from their traditional colors. Today, it’s not unusual to find clay and terracotta products in a range of hues, and designers, architects, gardeners, and homeowners often search for shades that match a specific color scheme. This is why quality control is essential, whether you’re manufacturing a traditional product or experimenting with new, exciting colors.
Spectrophotometers are essential for achieving color quality control.2 In part, this is due to the fact that these instruments are capable of detecting small variations in color that the human eye may not immediately see. Additionally, the naked eye is subjective when it comes to accurately assessing color samples, as environmental factors and biological limitations can result in variations in color perception between viewers or even when the same viewer observes an object at different times. Spectrophotometers eliminate this subjectivity; instead, they capture objective color data to ensure accuracy and consistency in your finished products.
Measuring the Color of the Product’s Raw Materials and Finish
Not only do spectrophotometers help you ensure accurate color quality control of finished product, these instruments can be used to test the impact of raw materials before the general production process begins. In particular, assessment of glaze can be a critical step in your quality control process, as the color and turbidity of your glaze can dramatically impact the final color of your product. Even the smallest variation in color could be grounds for concern, especially in large production runs of terracotta and other clay products. However, the impact of glazes can only be fully observed once applied and fired. As the authors of Ceramic Material Systems: in Architecture and Interior Design note, “In most processes involving glazes, test tiles or prototypical samples are made to ensure the glaze mix is consistent with expectations.”3 This prevents manufacturers from creating an entire batch of products that have serious color flaws, which in turn results in less product waste. After your samples comes out of the kiln, you can also apply and test additional finishes, such as paint or an additional glossy, protective coat of glaze, which may be similarly assessed.