Is it normal for aroma stones to have white powder? A guide to identifying shedding, moisture damage, and cleaning.

Author: LOX Editorial Team
Article Category: Aroma Stone Knowledge · Published: August 1, 2026, 09:42 (Taiwan Time)

If you notice a small amount of white powder on your aroma stone, it does not necessarily mean it is moldy or unusable. If it is just dry, fine dust left on the edges or the base due to friction, and the stone itself remains hard with no cracks or odors, you can generally clean it with a dry, soft-bristled brush and continue to monitor it. However, if the surface sheds powder when touched, has become locally soft, is peeling off in flakes, or has been exposed to dampness for a long time, you should stop adding fragrance and move it to a well-ventilated area for inspection. Do not soak the stone or scrub it vigorously with a wet cloth the moment you see white powder; porous plaster materials may temporarily weaken after absorbing water.

First, assess: Is it common fine dust or continuous pulverization?

Since white aroma stones are similar in color to the powder itself, it is easy to misjudge based on color alone. Before deciding how to handle it, please examine three things: "the location of the powder, the hardness of the stone, and whether it has been exposed to moisture."

Observation	Possible Cause	Recommended Action
Small amount of dry, fine dust on the base or corners	Friction from moving, packaging, or the tray	Clean with a dry brush; switch to a smooth tray
White or pale dry marks where fragrance was applied	Residue from liquid formula, or oil mixing with existing dust	Stop adding fragrance; absorb oil, ventilate, and monitor
Surface sheds powder when touched, partially soft	Repeated dampness, soaking, or loose structure	Stop using; do not scrub or add water
White spots accompanied by fuzzy growth, odor, or dampness	Cannot be treated as common stone dust	Isolate the item and stop using; avoid smelling it or disturbing the powder

Why does white powder appear on aroma stones?

1. Friction on edges and base

Petals, textures, and small protruding corners may generate a very small amount of surface powder during packaging, moving, or contact with rough surfaces. If the powder does not return after cleaning and the stone body remains intact, simply improving the contact surface is usually sufficient. It is recommended to place the stone on a glass, glazed ceramic, or metal tray. For details on materials, you can refer to What to Place Under Your Aroma Stone.

2. Surface weakness after dampness

Plaster is a porous, hydrophilic material. Research shows that the strength and softening coefficient of plaster may decrease after water absorption, and moisture can also enter the material through its pores. Therefore, repeated heavy spraying, soaking, or long-term placement in areas subject to direct water splashes are not effective ways to handle white powder. Further reading: Bathroom Placement and Humidity Guide.

3. Oil residue or mixed dust

White marks are not necessarily caused by stone shedding. If the marks only appear where fragrance is applied, they may be related to non-volatile components in the liquid, existing dust, or using too much at once. Do not immediately attribute the source of the powder to a specific ingredient; stop adding fragrance, use a fragrance-free paper towel to gently absorb any excess, and observe according to the steps for what to do if you used too much essential oil.

Reference: A study on water resistance of gypsum in Construction and Building Materials indicates that gypsum is highly absorbent and its properties decline after water exposure; another study on gypsum water resistance and mechanical properties explains that pores, hydrophilicity, and the limited solubility of gypsum crystals in water may weaken the bonds between crystals. These are material-level findings and do not equate to a failure diagnosis for a single finished product.

How to clean white powder? A six-step dry inspection method

1. Stop adding fragrance: Do not cover the white powder with new oil to prevent powder, liquid, and dust from mixing together.
2. Move to a flat tray: Use a glass or glazed ceramic tray; avoid operating directly on wooden tables or fabrics.
3. Take photos for records: Note the location of the powder so you can determine if it continues to increase after cleaning.
4. Small-scale dry brushing: Use a dry, clean, soft-bristled brush to gently sweep the surface; do not scrub back and forth with a hard brush.
5. Check hardness and edges: Do not scrape with your nails; only confirm if it has become noticeably soft, cracked, or is peeling in flakes.
6. Observe in a cool, ventilated place: Use in small amounts only after it is completely dry. If the powder reappears quickly or spreads, stop using.

Key judgment points for different materials

• Gypsum-based: More sensitive to water; avoid soaking or repeated wet wiping. If it has become soft or continues to peel, scrubbing is not recommended.
• Unglazed ceramic: Also porous, but has different surface hardness and manufacturing processes. If cracks, chips, or abnormal powder appear, follow manufacturer instructions.
• Minerals, cement, or composite materials: Compositions vary significantly; white precipitates are not necessarily plaster powder. Without specific material data, do not use acid, bleach, or detergents.

Three common usage scenarios

A little white powder on the tray after unboxing

First, check if the box was crushed or if the design has chips. If it is just a small amount of dry powder and the stone itself is intact, you can dry brush it and keep a photo for record. If there is damage, keep the packaging and contact the original place of purchase.

Becomes soft to the touch after placing in the bathroom

Remove it from the humid area immediately and stop adding fragrance. Do not use a hairdryer or direct sunlight for rapid drying. Refer to the Proper Air Drying Guide and judge whether it still sheds powder only after the material is completely dry.

White marks and oil marks appear together after adding fragrance

Use an oil-absorption method first; do not wash with water. Next time, perform a small test on an inconspicuous spot on the back, and decide whether to add more only after it is fully absorbed. To compare suitable liquids, read Essential Oils vs. Fragrance Oils.

Usage checklist to avoid further powder shedding

• Use a smooth, cleanable tray to prevent the base from rubbing against rough surfaces.
• Support the body when picking it up; do not pull on delicate petals, hanging cords, or protruding decorations.
• Maintain dryness and ventilation; avoid splashes from sinks, bathroom steam, and condensation from air conditioners.
• Apply fragrance in small amounts, wait for absorption, and increase gradually; do not make the surface wet or shiny.
• Test colored formulas with a single drop on the back first, and keep isolated from table surfaces, fabrics, and painted finishes.

Frequently Asked Questions (FAQ)

Does white powder on an aroma stone mean it is moldy?

Not necessarily. Dry, fine powder may come from friction or surface wear. If you see fuzzy growth, discolored spots, dampness, or detect an odor, stop using it and isolate it; do not smell it closely or scrape the powder away.

Can I wash the white powder off with water?

For gypsum-based stones, soaking or rinsing is generally not recommended. Water may enter the pores, temporarily weakening the material and making it harder to identify the original source of the powder.

Can I wipe it with a wet wipe?

A dry, soft-bristled brush is the priority. If the manufacturer explicitly allows wet wiping, test only on an inconspicuous spot and prevent liquid from seeping in. If there are no material instructions, do not wash it yourself.

Can I still add essential oils after cleaning the white powder?

If the stone is dry, hard, has no cracks, and the powder does not reappear, you can test by adding one drop on the back and only continue if it is fully absorbed. If it continues to shed powder or remains soft, stop using it.

If there is a lot of white powder, can I use a hard brush to smooth the surface?

Not recommended. Hard brushes and sanding may destroy design details, generate more dust, and cannot repair the internally loosened structure. In cases of extensive or continuous powder shedding, prioritize stopping usage, documenting with photos, and contacting the original retailer.

Looking to start with proper fragrance application? Check out the LOX Essential Oil Series. Before use, always follow the liquid usage labels and perform a small test on the back of the aroma stone. If you would like to explore other designs, feel free to browse the Customized Aroma Stone Series.