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\section{Colorimetric TTI (Time-Temperature Indicators) Films for Food Packaging Systems}  Time-temperature indicator (TTI) films are among the most promising intelligent packaging systems for the food industry. TTI films can safely indicate for the manufacturer or the final consumer, in real-time, the conditions of food processing, transportation, storage and deterioration. Nevertheless, it has the advantage of being of low cost and visually indicate the food conditions. The main idea behind TTIs is that many food products deteriorate due to changes in the temperature, which cause chemical reactions and microbial growth that can be detected by a TTI film. Several types of TTI, such as colorimetric~\cite{ Pacquit2007, Wu2013, Pereira_2015,Yoshida_2014, Zhang2014}, colorimetric~\cite{Pacquit2007,Wu2013,Pereira_2015,Yoshida_2014,Zhang2014},  radiofrequency~\cite{Length2010}, photochromic~\cite{Kreyenschmidt2010}, bacterial growth kinetic sensor~\cite{Zhang2013}, intelligent inks~\cite{Mills2005}, oxygen indicators~\cite{Vu2013, Eaton2002}, indicators~\cite{Vu2013,Eaton2002},  as well as nanotechnology sensor systems have been developed and successfully tested both in academy and in the industry. Among these systems, colorimetric TTI systems which can provide a response \textit{via} a color change according to pH changes of the product, providing information about the conservation and the actual quality of a food in a visual and intuitive way, have grown in importance and diversity, both in industry and academy, mainly due their low cost, simplicity and reliability. Besides their simplicity, the common feature of such systems is that they are based on biodegradable polymeric films and pH indicator dyes, thus not requiring expensive analytical instruments. Furthermore, there is a great interest of the food industry, retailers and consumers for environment friendly systems that can safely be applied as an accurate intelligent food-package.\par As colorimetric TTIs based on carbohydrate polymers as a supporting matrix with indicator dyes have been developed~\cite{Zhang2014,Nopwinyuwong2010,Pereira_2015,Golasz_2013,Yoshida_2014,Kuswandi_2012} and well-stablished in the literature, this chapter section will report the techniques of preparation and characterization of such systems as well as the perspectives of future development and real applications.  \par  \subsection{Film preparation}