What is the ideal temperature of water to increase the working time of alginate?

Using cold water to mix alginate extends its working time significantly. The temperature of the water affects the setting reaction of alginate, as alginate is a sodium alginate that reacts with calcium ions to form a gel. Cold water slows down this reaction due to reduced kinetic energy, allowing for a longer period during which the material remains workable. This can be particularly beneficial when precision is required for tasks such as making impressions.

In contrast, using hot water accelerates the setting process, and room temperature water does not provide the same extended working time as cold water. Iced water would also be counterproductive, as it could excessively slow down the reaction, potentially causing problems with achieving a proper mixture consistency. Therefore, using cold water is the ideal choice for maximizing the working time of alginate.