Welcome to the Roman Baths Blog!

This blog is a behind the scenes look at the Roman Baths in Bath. We hope you enjoy reading our stories about life surrounding the Roman Baths.

Wednesday, 8 August 2018

Tuesday Times Tables: Glorious Roman Glass

Have you ever wondered how glass was made in the Roman period, or what the components of Roman glass are?

Roman double-handled bulbous vase

Glass has three principal constituents: a former, a flux and a stabiliser. In antiquity, silica, in form of sand, acted as the former; soda was used as flux and calcium in form of lime was used as stabiliser. 

The Roman glassworker could vary the colour of the glass by adding specific metal oxides. Different quantities of these colouring agents, that have different chemical compositions, and manipulation of furnace temperatures produced a very wide range of translucent and opaque colours. 

The addition of copper produced a range of blues, greens and red; cobalt was for dark blue; iron was used for brown and black glass; manganese for yellowish or purple glass; and for the colourless or opaque white glass was used antimony.

Roman melon bead made from glass paste

The ingredients were initially heated together to a temperature of about 600 Celsius degrees to remove the impurities and this process, called “fritting”, produced the material known as frit. The best of the frit was then broken up and heated to 1100 Celsius degrees or more to form glass.  

Roman jar with thick zig-zag pattern from neck to shoulders

The three principal processes used to manufacture Roman glass vessels were casting, mould-blowing and free-blowing.

Tall slightly twisted Roman jug with strap handle

The casting was in widespread use in the early years of Roman Empire, but became rare towards the end of first century AD and occurred only occasionally thereafter. In the casting process the glass objects were cast by directing molten glass into a mould where it solidified. This technique created decorative effects by joining together prefabricated component parts, like handles, feet and rims. The most common cast vessel found in Roman Britain is the pillar-moulded bowl.

Modern glassmakers blowing glass

By the time of the Roman invasion of Britain in the reign of the Emperor Claudius in 43 AD, most Roman glass was produced by the blowing method. The invention of glass-blowing completely transformed the glass industry: it was now possible to produce a wide variety of forms more cheaply. 

It consists of an inflation of a gather (a mass of melted glass) onto the end of an iron rod. The glass could be blown in a mould or with the free-blowing method, but in this last case the glassworker had to shape the vessel by rolling the iron rod across a flat stone or a metal surface and by manipulation with tools. When the vessel was ready it was removed from the iron rod and then handles and other parts were added.

Michela Amato
Collections Placement

Wednesday, 1 August 2018

Tuesday Times Tables: Fascinating Flint

Flint is an exceptionally hard material, and if worked correctly, it can be sharper than a metal razor. It’s no surprise then that it is one of the first materials to be shaped by prehistoric man.

Examining flint tools today connects the modern world with the prehistoric in a way that reminds us of the extraordinary ingenuity that brought us to where we are now.

In an attempt to celebrate this connection, a small assortment of the Roman Baths’ most impressive flint tools were on display for one night next to the Great Bath for visitors to handle.

Our handling tables give visitors the chance to pick up and examine objects from our collection.

The Roman Baths has well over a thousand individual pieces of flint in its collection from archaeological sites throughout Bath and North East Somerset, including arrowheads, scrapers, and blades. At first glance, many visitors could easily make out the familiar shape of an arrowhead, or a small blade, but the earliest flint tools are less familiar. One of the most remarkable examples was on display for handling – a handaxe, found in Priston.

A Palaeolithic handaxe. The point of the axe has broken off.

We can recognise the handaxe (pictured above) by its sharp edges that would have joined at an obvious point, had the point not broken off. It sits in the hand comfortably, and provokes the holder to try and imitate its original owner. Self-restraint comes easy when reminded that this particular handaxe was created over 250,000 years ago.

Next to that, the other objects on the table seemed relatively young, ranging from 11,000 to 4,000 years old.

The age of these objects is often astounding, and almost impossible to grasp. Even more astounding is that prehistoric worked flint can be found in the most common of places, like a garden or field. All it takes is a keen eye and interest, and before long you could build up a collection as big as the Roman Baths!