Accurate gold testing is fundamental to fair valuation and consumer confidence. While acid testing has been used for decades, modern technologies such as X-Ray Fluorescence (XRF) testing offer more advanced, non-destructive analysis.
This article explores the differences between traditional acid testing and modern XRF testing, highlighting how technological advancements improve transparency, precision, and customer trust during gold transactions.
For gold owners seeking accurate valuations, understanding testing methodologies can help ensure confidence in every transaction.
KUALA LUMPUR, Malaysia — Every gold transaction, whether buying, selling, or exchanging, rests on a single question: is this gold what it claims to be? For decades, that question was answered with acid. Today, a growing number of Malaysian gold dealers are turning to a different method entirely, X-Ray Fluorescence, or XRF, testing, to verify purity with greater precision and without damaging the item being tested.
Razalie Abdul Rasull, third-generation leader of Abdul Razak Gold House (M) Sdn Bhd, a Kuala Lumpur gold trading company operating since 1950, has watched this shift unfold firsthand across three generations of family business.
“My grandfather tested gold with acid because that was the best available method at the time,” Razalie said. “Today, we have technology that can analyse a piece of gold’s composition in seconds, without a single scratch on the item. That’s a meaningful change for both accuracy and customer trust.”
Why Purity Testing Matters
Gold purity determines value. In Malaysia, gold is most commonly traded in 916 (22-karat, approximately 91.6 percent pure) and 999 (24-karat, approximately 99.9 percent pure) standards, though older jewellery, foreign pieces, or unmarked items may not carry a reliable stamp. Before any fair valuation can take place, whether for a buyback, an exchange, or an investment purchase, the dealer must first establish exactly what the item is made of.
“A price is only as accurate as the purity test behind it,” Razalie said. “If the testing method is unreliable, the valuation built on top of it is unreliable too, no matter how fair the pricing formula looks on paper.”
Acid Testing: The Traditional Method
Acid testing has been used in the jewellery and gold trading industry for generations. The process involves making a small mark or scratch on the gold item, then applying a nitric acid-based solution to observe the reaction. Different acid concentrations react differently depending on the gold’s purity, allowing an experienced tester to estimate the karat value based on the result.
The method is inexpensive, portable, and well understood by experienced gold traders, which is part of why it has remained in use for so long. However, it comes with notable limitations.
“Acid testing requires marking the item, even if it’s a small scratch, and it depends heavily on the tester’s experience to interpret the result correctly,” Razalie said. “It also tests only the surface, which becomes a real limitation with plated or layered items.”
XRF Testing: The Modern Alternative
X-Ray Fluorescence testing uses a handheld or benchtop device that directs low-level X-rays at a gold item. The item’s atoms respond by emitting a unique fluorescent signature, which the device reads and translates into a precise breakdown of the metal’s composition, including gold content, alloy metals, and overall purity.
“XRF gives us a full compositional readout, not just an estimate,” Razalie explained. “It shows the exact percentage of gold, along with what other metals are present, and it does this in under a minute without touching or damaging the item.”
Because XRF testing is non-destructive, it has become particularly valuable for testing antique jewellery, items with sentimental or heirloom significance, and pieces where the owner does not want any physical alteration made, even a small one.
Comparing the Two Methods
Industry practitioners generally point to several key differences between the two approaches:
Precision. XRF testing provides a detailed elemental breakdown, while acid testing offers an estimated range based on visual reaction.
Non-destructive analysis. XRF requires no scratching or marking of the item, while acid testing typically leaves a small, usually inconspicuous mark.
Depth of analysis. XRF can be configured to assess composition beyond the immediate surface, which matters for plated or layered items, whereas acid testing primarily reacts to surface metal.
Speed and consistency. XRF results are digital and repeatable, reducing reliance on individual tester interpretation, while acid testing outcomes can vary slightly between testers.
Cost of equipment. XRF devices represent a significant upfront investment for a dealer, which is part of why adoption has been gradual across the industry, while acid testing kits remain low cost and widely available.
“Neither method is inherently dishonest, acid testing has served the industry well for a long time,” Razalie said. “But if a customer is trusting us with a valuable or sentimental piece, we want to give them the most accurate, least invasive answer available, and today that’s XRF.”
Building Customer Confidence Through Technology
For Abdul Razak Gold House, the adoption of XRF testing is presented as part of a broader effort to modernise customer-facing transparency, alongside live gold pricing and digital weighing scales used during in-person transactions.
“Testing, weighing, and pricing are the three pillars of a fair transaction,” Razalie said. “If any one of them is unclear to the customer, trust breaks down. We’ve tried to make all three visible and explainable at the counter.”
Razalie added that customers are increasingly asking about testing methodology before a transaction, a shift he attributes to broader consumer awareness around gold investment and resale value.
“Ten years ago, almost nobody asked how we tested their gold,” he said. “Now it’s one of the most common questions we get, and that’s a good thing. An informed customer is exactly who we want to be dealing with.”
Industry Context: Testing Standards in Malaysia’s Gold Market
As Malaysia’s gold market has grown, both through traditional jewellery ownership and increasing interest in gold as an investment asset, testing accuracy has become a more prominent part of the conversation around consumer protection. Reliable purity testing underpins the fair pricing of everything from a single gold ring brought in for buyback to bulk gold bar transactions.
Razalie noted that as more Malaysian consumers educate themselves on gold purity standards, karat markings, and testing methods, dealers are increasingly expected to explain their processes clearly rather than simply state a final offer.
“The days of a customer just accepting a number without asking how it was reached are ending,” Razalie said. “That’s a positive shift for the whole industry, and it’s one we’ve tried to stay ahead of.”
Looking Ahead
Razalie said Abdul Razak Gold House plans to continue investing in testing technology and customer education, including explaining testing methodology openly as part of every transaction, whether a customer is selling an heirloom, exchanging old jewellery, or purchasing investment-grade gold.
“My grandfather built this business on trust during a time when that trust was built through experience and reputation alone,” Razalie said. “Today, we can back that same trust with precise, non-destructive technology. That combination, heritage and accuracy, is what we want customers to feel every time they walk through our doors.”
For gold owners considering a sale, exchange, or valuation, the underlying message from industry practitioners remains clear: understanding how your gold is tested is just as important as understanding what it is worth.
