Use of The Rare Earth Salts in The Textile Dyeing

and a Tool For Automation And Control

R. Lotfi

UFR de Chimie Appliquée, Faculté des Sciences et Techniques de Mohammadia.

B.P. 146, Quartier Yasmina, Mohammadia, Maroc

* Corresponding author. E-mail:

Received : 21 June 2004; revised version accepted : 17 April 2005


Dyeing by means of synthetic or natural chemicals is used since many centuries. Dyeing by addition of rare earth salts have been attempted at the laboratory level since two decades. We tested such experiences on different rare earth metals and different kinds of synthetic materials. Some of these results have been recently published and patented by us.

In the present paper we show that it is possible to quantify the effect of the action of rare earth salts. The results are given for LaCl3, La(NO3) 3 and NdCl3, added to dyeing solutions containing Rubia Tinctorium containing alizarine dye.

The increase of the colour intensity can be used as a tool to increase the sensitivity of the signal in the control of dyeing process by means of absorbency.

Keywords: Dyeing, rare earth salts; Modelling, Rubia Tinctorium; Wool textile; Analytical chemistry; Process control.

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