diff --git a/docs/files/recipes/phmodifiers.md b/docs/files/recipes/phmodifiers.md
index d44135e422a1d4f57091ab452eaeee5608da2bda..c23ad414a47f49c413ac619024edc5b6819384b3 100644
--- a/docs/files/recipes/phmodifiers.md
+++ b/docs/files/recipes/phmodifiers.md
@@ -102,13 +102,13 @@ Four PH modifying solutions of approx. 170 ml each (PH 1-2, PH 5-6 acidic, and P
 
 ### Process
 
-![](../../images/phpaper13.jpg)*The cabbage dye on a coffee filter, drying, Loes Bogers, 2020*
+![](../../images/phpaper13.JPG)*The cabbage dye on a coffee filter, drying, Loes Bogers, 2020*
 
-![](../../images/phpaper11.jpg)*Folding the paper, Loes Bogers, 2020*
+![](../../images/phpaper11.JPG)*Folding the paper, Loes Bogers, 2020*
 
-![](../../images/phpaper10.jpg)*Securing and cutting the paper, Loes Bogers, 2020*
+![](../../images/phpaper10.JPG)*Securing and cutting the paper, Loes Bogers, 2020*
 
-![](../../images/phpaper9.jpg)*Cutting tear-off strips, Loes Bogers, 2020*
+![](../../images/phpaper9.JPG)*Cutting tear-off strips, Loes Bogers, 2020*
 
 ![](../../images/phmodifiers1.jpg)*Soda ash and citric acid, Loes Bogers, 2020*