Cranfield

From the Cranfield website:

This is a thixotropic alkyd medium designed to mix with oil colours, retaining the body of the paint. Spectragel is a gloss medium and is quick drying. It is a clear medium based on a synthetic resin that improves the weather resistance of oil colours; ideal for glazing and extending colours while retaining gloss and structure of paint.

From the Cranfield website:

This free flowing, slightly thixotropic medium is alkyd based and will not increase gloss when added to oil colours. It is quick drying.

From the Cranfield website:

An almost transparent painting medium based on refined linseed oil and alumina. It is similar in consistency to Studio Oil Colours in tubes. It does not promote quick drying and may be used to extend oil colours. It can be used in large ratios where the desired effect is to increase yellowing and darkening of pale colours. It will not increase gloss.

From the Cranfield website:

A pereparation of pure beeswax in white spirit, this is used to achieve a soft sheen on your finished painting. It will retard drying, allowing you to achieve a range of effects.