Ideal for storing and serving sauces, condiments, spices, chutneys, preserves and more. This Vintage Preserving Jar 250ml is constructed from quality glass with an embossed vintage decal and a 2 piece vacuum seal lid. To vacuum seal your jars, immerse your closed jars in boiling water for 30 minutes, leaving it to simmer. Once boiled, allow the water and jars to cool completely before removing. Your vacuum sealed jars will preserve contents for up to 6 months if stored in a cool, dry place. Available in 250ml, 500ml and 1L capacity.