Frequently Asked Questions
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The 100ml cobalt blue glass calibrated dropper bottle is a bulk size for carrier oils, hair oils, Ayurvedic and body oils and refill packs — products dispensed by the ml, not the drop — and for salons and formulators who keep a working bottle on the bench. Cobalt blue gives partial light protection and a striking shelf presence.
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Roughly 2,000 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 100ml bottle is around 50 applications of a 2ml hair or body oil dose. Tell customers the drop count on the label; it is the number they ask about.
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Partly — cobalt blue glass filters some visible light but lets more UV through than amber. It is chosen for its look as much as for protection; if the formula is UV-sensitive (essential oils, vitamin C), sell it in a carton or pick amber or black instead.
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It comes with a calibrated glass pipette — graduated markings on the tube so you can draw a measured dose (0.25, 0.5, 0.75, 1ml) rather than counting drops. The collar and bulb come in Silver + Black, Gold + Black, Gold + White, Silver + White and Black (collar colour + bulb colour).
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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 100ml dropper bottle also comes in amber, black, clear, frosted amber and green glass and in flat-shoulder shapes, 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 100ml cobalt blue glass calibrated 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.