View source for Fluorescent Yellow

{{Ink
|japanese_name=蛍光イエロー
|brand=Riso
|series=Custom
|hex=F7FF00
|rgb=247,255,0
|cmyk=3,0,100,0
|cielab=97,-19,51
|pantone=803 U
|products={{Ink/product
|product_line=Z-Type
|product_id=S-7761
}}
}}
[[Fluorescent Yellow]] is a vibrant, high-visibility [[:Category:Riso inks|ink]] used in [[risograph]] printing, known for its bold, luminous quality and unique visual impact. a [[Custom Series|Custom series]] ink manufactured by the [[Riso Kagaku Corporation]].

== Characteristics ==
Fluorescent Yellow ink is somewhat opaque, which can make it challenging to overprint with other inks. As [[Fluorescent_Yellow#Printing_tips|noted below]], it is best if printed last. Like all fluorescent inks produced by Riso, it [[Blacklight|glows brightly under blacklight]] due to its phosphorescent properties. This quality makes it a striking choice for posters and other printed materials designed for environments where blacklight is used. The ink's fluorescence is achieved through pigments that absorb ultraviolet (UV) light and re-emit it as visible light, enhancing its vivid and luminous appearance.

==Ingredients== 
{| class="wikitable"
|-
! Ingredient Name !! CAS No. !! EINECS No. !! Classification (EC 1272/2008) !! wt%
|-
| [[Glycerol]] || 56-81-5 || 200-289-5 || Not classified || 0–10
|-
| [[Petroleum solvent]] || 74869-22-0<br>64742-47-8 || 278-012-2<br>926-141-6 || Not classified<br>Asp. Tox. 1; H304 ||  0–5
|-
| [[Pigment]] || Trade secret || Trade secret || Not classified || Trade secret
|-
| [[Alkyd resin]] || Trade secret || Not applicable || Not classified || Trade secret
|-
| [[Water]] || 7732-18-5 || 231-791-2 || Not classified || Trade secret
|}
Ingredients provided by the [[Riso UK]] [[material safety data sheet]]<ref>https://www.riso.co.uk/sds/2023/RG/RFI026E-03.pdf</ref> 

== Availability ==
Because Riso has chosen not to distribute its new fluorescent inks in [[North America]], these inks are difficult to obtain in the Western Hemisphere, as all distribution for North and [[South America]] is centralized in the [[United States]]. It is widely available throughout Riso's other core markets, like Asia and [[Europe]].

== History ==
Released in 2017, preview ink samples of Fluorescent Yellow, {{Ink chip|Fluorescent Green}}, and {{Ink chip|Fluorescent Red}}  were presented by [[Riso Benelux]] marketing staff at the [[Magical Riso|Magical Riso symposium]] in late 2016.

==Examples in print==
<gallery mode="nolines" widths="300" heights="300">
File:Fluorescent Yellow promo ink sample.jpg|alt=Fluorescent Yellow print sample|Print sample presented by Riso Benelux staff at Magical Riso 2016.
File:Fluorescent Yellow Borealis Postcard.webp|alt=Fluorescent Yellow print sample|Fluorescent Yellow under blacklight, printed by [[Pamflett]].

</gallery>

== Printing tips ==
Riso's fluorescent inks are tackier and slower to dry compared to standard Riso inks, requiring thoughtful planning of the print order and design. Fluorescent Yellow ink, in particular, can clog the perforations in stencils, preventing subsequent colors from printing effectively. For this reason, it is recommended to use fluorescent inks as the final layer in the print sequence whenever possible.
{{Ink/preload}}