Frequently Asked Questions
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The 30ml black 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. Black glass blocks light almost completely, for the most light-sensitive actives and a dark luxury look.
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Roughly 600 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 30ml bottle is about two to three months of a face serum used twice a day (three or four drops each time). Tell customers the drop count on the label; it is the number they ask about.
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Yes — black glass blocks almost all light, more than amber, so it is the choice for the most light-sensitive actives and for brands that want a dark, luxury look. The one trade-off: you cannot see the fill level, so dose by drops or weight rather than by eye.
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Every bottle ships with its pipette, collar and bulb — pick the finish when you order: Gold + White, Silver + White, Gold + Black, White + White and Black + Black. The first word is the collar (the ring you screw on), the second is the bulb; “Black” or “All Black” is an all-black plastic collar and bulb.
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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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Yes — the 30ml dropper bottle also comes in amber, clear, cobalt blue, frosted amber, frosted clear, green and painted (many colours) glass, in flat-shoulder, oval, rectangular, square and triangle shapes and with a gold crown cap or press-button dropper, all listed in the serum and dropper collection. If you want a pump or spray on this size instead of a dropper, ask on WhatsApp with the SKU and we will match one to the neck.
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Yes — RENTRASPA dispatches the 30ml black 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.