Frequently Asked Questions
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The 20ml painted glass dropper bottle is the retail standard for face serums and facial oils — the size most skincare brands sell as their main SKU — and it also suits essential-oil blends, hair-growth oils and treatment oils where a few drops are a dose. The painted coating blocks light and gives a branded colour without a label.
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Roughly 400 drops — a standard glass pipette gives about 20 drops per millilitre of a water-thin oil, and thicker carrier oils give fewer, larger drops. In practice a 20ml bottle is about three months at four drops a day. Tell customers the drop count on the label; it is the number they ask about.
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Mostly — the opaque coating blocks most light (the frosted painted colours a little less), and the paint is on the outside, so the product only ever touches glass. It is the closest thing to black-glass protection with a colour of your own.
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The choice here is the bottle colour — Frosted Yellow, Frosted Red, Frosted Orange, Frosted Green, Frosted Cyan and Frosted Purple — with a matching black dropper. Every bottle ships with its pipette, collar and bulb fitted; there is nothing else to buy.
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Straight answer: a pipette dropper is a dispensing closure, not a shipping seal. On a shelf or dressing table it holds fine; in a courier parcel it can weep if the bottle lies on its side or the bulb is squeezed. Fill only to the shoulder, pack upright with the bulb up, and use a shrink band over the neck for parcels. Every dropper we sell is matched and checked to its bottle, but for a product that ships loose every day our euro-dropper bottles with a screw cap are the safer format.
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No minimum online — order one piece to check the fit, then buy in bulk when the formula is final. The price on this page steps down as the quantity goes up; from 500 pieces WhatsApp +91 75500 42423 and we quote the exact item and quantity directly. Printed or painted bottles start at 1,000 pieces and custom closures at 5,000, and every order comes with a GST invoice.
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No — they ship straight from the factory cartons, not pre-washed or sterilised. Wash the bottles, pipettes, collars and bulbs before filling: warm water with a mild detergent, rinse well, then sterilise (a 70% isopropyl-alcohol rinse, or hot water for the glass parts; do not boil the rubber bulbs) and air-dry fully, necks down. Never fill a damp bottle.
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The 20ml is a single-option size, but the other sizes of this range run from 3ml sample vials to 120ml bulk bottles in amber, clear, frosted, black, cobalt blue, green and painted glass. If you want a pump or spray on this size instead of a dropper, ask on WhatsApp with the SKU.
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Yes — RENTRASPA dispatches the 20ml painted glass dropper bottle from Chennai to every state: Bangalore, Mumbai, Delhi, Hyderabad, Pune, Kolkata and tier-2 cities alike. In-stock orders leave within three working days. Order online with no minimum, or WhatsApp +91 75500 42423 for a wholesale quote; every order gets a GST invoice.