In addition to improved visualisation sensitivity provided by the HFE-7100 all-in-one spray relative to the equivalent AK-225 spray, the colouration of fixed iodine-treated fingermarks persisted longer after HFE-7100 spraying. To show this, a single donor laid seven natural split fingermarks on tile. The fingermarks were then divided, and each half received a separate spray treatment. The treated fingermarks were finally recombined and documented after certain time intervals had elapsed. When documented immediately, the intensity of development did not differ greatly between HFE-7100 and AK-225 treatments (Fig. , left). However, after delays of 4 and 24 hours (Fig. , centre, right), the HFE-7100 treated fingermarks consistently retained more intense ridge development. The slower fading shown by the HFE-7100 spray may be beneficial when processing large scenes or multiple items of evidence as it will reduce the need for practitioners to quickly alternate between chemical treatment and documentation of fingermarks to mitigate loss of detail.