Fig. 2

Images from syringes 1 [Saldanha Rodrigues (SR) 1-mL insulin syringe, a–d], 2 [Becton–Dickinson (BD) Plastipak 1-mL insulin syringe, e–h], and 3 [BD Safetyglide insulin syringe, i–l]. In syringe 1, oil droplets are seen in all groups: a Isolated silicone oil droplet in a positive control without agitation (group 1). b Multiple silicone oil droplets in a positive control with agitation (group 2). c Isolated silicone oil droplet in fluid-only without agitation (group 3). d Multiple silicone oil droplets in fluid-only with agitation (group 4). In syringe 2, no oil is seen in groups 3 and 4: e Positive control without agitation (group 1). f A positive control with agitation (group 2). g Fluid-only without agitation (group 3). h Fluid-only with agitation (group 4). In syringe 3, silicone oil is seen in three groups. i Isolated silicone oil droplet in a positive control without agitation (group 1). j Multiple silicone oil droplets in a positive control with agitation (group 2). k No silicone oil droplet in fluid-only without agitation (group 3). l Four silicone oil droplets in fluid-only with agitation (group 4)