This report is part of a series of studies that aim to improve the Indonesian seaweed industry by increasing the standard of seaweed produced as well as providing a useful tool for monitoring and measuring seaweed quality. The report puts a focus on the province of South Sulawesi because of the importance of the industry as a source of income for more than 35,000 households. The Indonesian government recognises the potential for an improved seaweed industry to reduce poverty in coastal communities. Our report is part of a comprehensive investigation into the South Sulawesi seaweed value chain, covering everything from production to consumption. We focused on developing a non-invasive and rapid infrared technique for measuring the composition and quality of seaweed. As part of this, we collected and analysed seaweed samples from low-income producers using modern methods based on infrared technology and data analytics. We aimed to provide producers and the industry with a tool that can effectively monitor and measure seaweed quality. Our study investigated the quality and chemical composition of seaweed samples from South Sulawesi, Lombok and Java and found that the composition and quality of seaweed varies depending on where they are from, with chemical composition affected by temperature and sea conditions. The ingredient carrageenan is the primary biomarker for red seaweed quality and our findings showed that geography plays a role in the quality of seaweed with samples from Lombok having higher levels of carrageenan than those from South Sulawesi and the island of Java. We also found that near-infrared spectroscopy is a quick and easy way to identify the location where seaweed was grown. We propose four policy recommendations to achieve growth and efficiency in the seaweed industry in South Sulawesi. • Increase carrageenan seaweed production: The primary indicator of seaweed quality is carrageenan and given that lower levels of this are found in the South Sulawesi product there is a need for farmers and the industry to increase the carrageenan levels in seaweed which would lead to improved income. • Conduct further location tests: A quick analytic tool such as near-infrared spectroscopy can be used to determine the origin location of seaweed. Once results start being collected they should be tested, confirmed and the technology improved by trialling it over several years and in different locations. • Conduct further tests of quality control methods: The near infrared method that has been developed also requires further testing to create a reliable quality control method. This means validating using a larger sample size from multiple locations and over multiple years. • Conduct further equipment checks: Additional studies are needed to test the models that have been developed and assess the potential of inexpensive and user-friendly handheld instruments.