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Despite their advantages, the implementation of agricultural seals is not without challenges. The certification process can be complex and costly, particularly for small-scale farmers. Additionally, there is the risk of fraud, where products are falsely labeled with seals they do not legitimately bear. To combat this, it is crucial for regulatory bodies to enhance oversight and develop robust verification processes.

When selecting an oil seal manufacturer, there are several factors to consider

What is an Oil Seal?

As early as sixty years ago, zinc sulphide was first thought of as a pigment for coloring India rubber and a patent for the process of its manufacture was issued in England. But it was not until twenty years later that zinc sulphide and its manufacture was seriously considered as a pigment for paint, and in 1874 a patent was issued for a process of manufacturing a white pigment, composed of zinc sulphide and barium sulphate, known as Charlton white, also as Orr's white enamel. This was followed in 1876 by a patent issued to a manufacturer named Griffith and the product, which was similar in character to Charlton white, was known as Griffith's patent zinc white. In 1879 another patent for a more novel process was obtained by Griffith & Cawley, the product made under this process proving the best of the series placed upon the market up to that date. After that time many new processes were patented, all, however, tending to the same object, that of producing a white pigment, composed of zinc sulphide and barium carbonate, the results, however, in many cases ending with failure.

Overall, the Food Directorate's comprehensive review of the available science of TiO₂ as a food additive showed:

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