Gurr Buffer Tablets Gibco® Gurr Buffer Tablets offer a convenient way to prepare a pH 6.8 phosphate buffer for dilution of Giemsa stain used in G-banding of chromosomes for cytogenetic analysis. Simply add one buffer tablet to one liter of distilled water and stir until dissolved. Product Size: 50 x 1 L Shipping Condition: Room Temperature Regulatory Statement: For In Vitro Diagnostic Use. Storage conditions: 15–30°C Shipping conditions: Ambient