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The "chromosome maps" (ChMs) of globular clusters (GCs) have revealed thatthese ancient structures are not homogeneous in metallicity in various ways,and in different natures. The Type II GCs generally display larger variations,sometimes coupled with slow neutron capture (s) element enrichment on the ChMsredder sequences, which has been interpreted as due to multiple generations ofstars. On the other hand, most GCs have inhomogeneous first populations (1P) inthe form of large ranges in the Delta(F275W,F814W) values, pointing towards anot fully mixed pristine molecular cloud. We analyse the chemical compositionthe GC 47 Tucanae, which shows both inhomogeneous 1P stars and, although notformally a Type II GC, hosts a small number of stars distributed on a red sideof the main stream of ChM stars. Our results suggest that 1P stars are nothomogeneous in the overall metallicity, with variations of the order of ~0.10dex in all the chemical species. The anomalous stars distributed on a reddersequence of the ChM, are further enriched in metals, but without any evidencefor a significant enrichment in the s elements. Our three second populationstars located on the normal component of the map, have metallicities similar tothose of the metal-richer 1P group, suggesting that this population formed fromthese stars. Although three stars is a too-small sample to draw strongconclusions, the low spread in metals of these objects might point towards aformation in a fully mixed medium, possibly after a cooling flow phase.

The metallicity variations along the chromosome maps: The Globular Cluster 47 Tucanae