A two-page article from The Melliand by Dr. Nüsslein on using Nekal BX dry, a wetting agent, in the indigo-hydrosulphite-soda vat for dyeing cotton. It reports on how Nekal changes the vat's appearance, the particle size and filtration of precipitated indigo, and the effects on vat stability and shade depth at different concentrations per 10 gallons. The text ends with "To be continued"; two photographs show dyed nettle samples.

A 1929 article by Dr. Nüsslein on Palatine Fast Colours, a class of dyestuffs that behave like chrome-developing dyes in fastness but are applied like acid dyes. It covers the history of colour fastness in wool dyeing, the dyeing method (sulphuric acid, no Glauber's salt), suitable end uses such as suitings, costume cloths, linings and hosiery yarns, and limitations such as milling fastness and cost. A plate of eight dyed swatches lists the dye recipes used.