Acknowledgement

To Professors Roberto Alves Monteiro, Emanoel Castro Antunes Felício, Marcelo Giordan Santos and William Cobern.

To Paulo Vitor Naves by his conversion of activities 1-9 to Flash.

To the experts from Minas Gerais who know the ash soap: Maria Celeste, Margarida, Maria Benedita, Izabel, Aparecida, Rosa and Anésia, to Mr. Sebastião and to the family of  Mr. and Mrs. of São Tiago.

These people offered their knowledge and practices in the studies performed initially and some of them have been through for another life.

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