Paying a large amount in cash for an art purchase is a typical red flag of potential money laundering, as it may indicate an attempt to avoid traceability and reporting requirements. Cash transactions are often used by criminals to launder illicit funds, as they are difficult to track and verify. According to the FATF guidance on money laundering and terrorist financing risks in the art trade, cash payments above a certain threshold should be subject to enhanced due diligence and reporting obligations by art market participants (AMPs). AMPs should also be wary of customers who provide insufficient or inconsistent information about the source of funds, the purpose of the transaction, or the identity of the beneficial owner.
References:
Money Laundering and Terrorist Financing Risks and Vulnerabilities Associated with Gold, FATF, July
2023, p. 22-23.
Money Laundering and Terrorist Financing Vulnerabilities of Legal Professionals, FATF, June 2023, p. 38-39.
Red Flags Money laundering and terrorist financing risks, Responsible Art Market, 2017, p. 2.

Explanation/Reference: https://books.google.com.pk/books?id=gy8qBAAAQBAJ&pg=PA219&lpg=PA219&dq=measure+to
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According to the Wolfsberg Group, a global association of leading banks that develops guidance and standards for the management of financial crime risks, both private and correspondent banks should monitor account and transactional activity after the proper identification and verification of customers, as part of their anti-money laundering and counter-terrorist financing (AML/CTF) measures12. This is consistent with the FATF Recommendation 10, which requires financial institutions to conduct ongoing due diligence on their business relationships, including scrutinising transactions to ensure that they are consistent with the customer's risk profile and source of funds3. Monitoring account and transactional activity is a key component of the risk-based approach, as it enables banks to detect and report suspicious or unusual transactions, identify changes in customer behaviour or circumstances, and update customer information and risk assessments accordingly4.
References:
1: Wolfsberg Anti-Money Laundering Principles for Private Banking (2012)
2: Wolfsberg Correspondent Banking Due Diligence Questionnaire (2017)
3: The FATF Recommendations - Financial Action Task Force
4: Risk-Based Approach for the Banking Sector - Financial Action Task Force