ART
BEAUTY & WELLNESS
CRAFT
CULTURE & HISTORY
ENTERTAINMENT
ENVIRONMENT
FOOD & DRINKS
REVERSE ENGINEERING
SCIENCES
SPORTS
TECHNOLOGY
WEARABLES
Dark Glass Jar: Blown from Cobalt Blue Glass, with a Cork Lid
Forge

Created by

Forge

17. October 2026NO
2
0
0
0
0

Dark Glass Jar: Blown from Cobalt Blue Glass, with a Cork Lid

A storage jar in dark glass: blow the wide-mouth jar of the jar blueprint, but gather deep-blue cobalt glass instead of clear. Anneal it, grind the base flat and press in a cork cut to the mouth. The picture: our diagram of the jar and its cork.
Advanced
Half a day, plus annealing

Instructions

1

Blow, open and anneal the jar

The furnace work, opening the mouth, annealing and the cork lid, step by step.
2

Gather blue glass

Melt cobalt blue glass in the furnace, gather it, marver it into a cylinder and blow a straight-sided bubble with a flat base.

Materials for this step:

Cobalt Blue GlassCobalt Blue Glass1 kg

Tools needed:

Glass Furnace Capable of Reaching 1100 Degrees CelsiusGlass Furnace Capable of Reaching 1100 Degrees Celsius
Glassblowing BlowpipeGlassblowing Blowpipe
MarverMarver
Glassblower's BenchGlassblower's Bench
Heat-Resistant GlovesHeat-Resistant Gloves
Safety GlassesSafety Glasses
3

Open the mouth

Transfer to the pontil, crack off the pipe, reheat and open the mouth with the jacks to nearly the body's width.

Tools needed:

Pontil RodPontil Rod
Glassmaker's JacksGlassmaker's Jacks
Glass Furnace Capable of Reaching 1100 Degrees CelsiusGlass Furnace Capable of Reaching 1100 Degrees Celsius
Glassblower's BenchGlassblower's Bench
4

Anneal and grind

Crack the jar off into the annealing oven. When cold, grind the pontil mark flat.

Tools needed:

Annealing OvenAnnealing Oven
Heat-Resistant GlovesHeat-Resistant Gloves
Sandpaper SheetSandpaper Sheet
5

Fit a cork lid

Measure the mouth, punch a cork a little wider from cork bark and taper its lower edge so it presses in tight.

Materials for this step:

Cork Bark PlankCork Bark Plank0.1 kg

Tools needed:

Digital Caliper 6-InchDigital Caliper 6-Inch
Cork BorerCork Borer
Utility KnifeUtility Knife
Sandpaper SheetSandpaper Sheet

Materials

2

Tools Required

13

This blueprint makes

Thumbnail
Placeholder

Dark Glass Jars with Airtight Lids

Free

172
0
1

Related Blueprints

These blueprints share knowledge with this one — techniques, materials, or principles that connect them in the learning graph.

Blown Glass Jar with a Cork Lid

Blown Glass Jar with a Cork Lid

by ForgeNO

Glassworking

40
0
0
0
0
0
Cobalt Blue Glass

Cobalt Blue Glass

by CharlieDE

Glassworking

52
0
0
0
0
0
Natural Cork Stoppers from Bark

Natural Cork Stoppers from Bark

by WoodyNO

Woodworking

38
0
0
0
0
0

CC0 Public Domain

This blueprint is released under CC0. You are free to copy, modify, distribute, and use this work for any purpose, without asking permission.

Support the Maker by purchasing products through their Blueprint where they earn a Maker Commission set by Vendors, or create a new iteration of this Blueprint and include it as a connection in your own Blueprint to share revenue.

Discussion

(0)

Log in to join the discussion

Loading comments...