diff --git a/src/assets/countries.json b/src/assets/countries.json
index 4987938ec..91e69b3d6 100644
--- a/src/assets/countries.json
+++ b/src/assets/countries.json
@@ -1485,7 +1485,7 @@
     "id": "en:world",
     "label": "World",
     "languageCode": "en",
-    "countryCode": "world"
+    "countryCode": ""
   },
   {
     "id": "en:yemen",
diff --git a/src/components/ResponsiveAppBar.jsx b/src/components/ResponsiveAppBar.jsx
index d991f7385..07da99c1c 100644
--- a/src/components/ResponsiveAppBar.jsx
+++ b/src/components/ResponsiveAppBar.jsx
@@ -413,21 +413,22 @@ const ResponsiveAppBar = () => {
               }}
             >
               <Select
-                value={country}
-                onChange={(event) => setCountry(event.target.value, "global")}
+                value={country || "world"}
+                onChange={(event) =>
+                  setCountry(
+                    event.target.value === "world" ? "" : event.target.value,
+                    "global",
+                  )
+                }
                 variant="outlined"
                 sx={{ fieldset: { border: "none" } }}
               >
-                {countryNames
-                  .filter((country) => country.countryCode)
-                  .map((country) => (
-                    <MenuItem
-                      value={country.countryCode}
-                      key={country.countryCode}
-                    >
-                      {country.label} ({country.countryCode})
-                    </MenuItem>
-                  ))}
+                {countryNames.map(({ label, countryCode }) => (
+                  <MenuItem value={countryCode || "world"} key={countryCode}>
+                    {label}
+                    {countryCode && ` (${countryCode})`}
+                  </MenuItem>
+                ))}
               </Select>
               <IconButton
                 color="inherit"
diff --git a/src/contexts/CountryProvider/CountryProvider.tsx b/src/contexts/CountryProvider/CountryProvider.tsx
index dcffa8a0e..2d8a4a6ea 100644
--- a/src/contexts/CountryProvider/CountryProvider.tsx
+++ b/src/contexts/CountryProvider/CountryProvider.tsx
@@ -7,7 +7,7 @@ import countries from "../../assets/countries.json";
 const ValidCountryCodes = new Set(countries.map((c) => c.countryCode));
 
 export function CountryProvider({ children }) {
-  const [country, setCountry] = useLocalStorageState("country", "world");
+  const [country, setCountry] = useLocalStorageState("country", "");
   const [searchParams, setSearchParams] = useSearchParams();
 
   const searchParamsCountry = searchParams.get("country")?.toLowerCase();
@@ -26,9 +26,16 @@ export function CountryProvider({ children }) {
   );
 
   const value = React.useMemo(() => {
-    const lowercasedCountry = (
-      ValidCountryCodes.has(searchParamsCountry) ? searchParamsCountry : country
-    )?.toLocaleLowerCase();
+    // Try from:
+    // - searchParams
+    // - localStorage
+    // - empty
+
+    const lowercasedCountry = ValidCountryCodes.has(searchParamsCountry)
+      ? searchParamsCountry
+      : ValidCountryCodes.has(country?.toLocaleLowerCase())
+      ? country?.toLocaleLowerCase()
+      : "";
 
     return {
       country: lowercasedCountry,
diff --git a/src/pages/nutrition/Instructions.tsx b/src/pages/nutrition/Instructions.tsx
new file mode 100644
index 000000000..beec4202a
--- /dev/null
+++ b/src/pages/nutrition/Instructions.tsx
@@ -0,0 +1,99 @@
+/* eslint-disable react/no-unescaped-entities */
+import * as React from "react";
+import Button from "@mui/material/Button";
+import Dialog from "@mui/material/Dialog";
+import DialogActions from "@mui/material/DialogActions";
+import DialogContent from "@mui/material/DialogContent";
+import DialogContentText from "@mui/material/DialogContentText";
+import DialogTitle from "@mui/material/DialogTitle";
+import Typography from "@mui/material/Typography";
+
+export default function Instructions() {
+  const [open, setOpen] = React.useState(false);
+
+  const handleClickOpen = () => {
+    setOpen(true);
+  };
+
+  const handleClose = () => {
+    setOpen(false);
+  };
+
+  return (
+    <React.Fragment>
+      <Button
+        size="small"
+        variant="outlined"
+        onClick={handleClickOpen}
+        sx={{ margin: 2 }}
+      >
+        Instructions
+      </Button>
+      <Dialog
+        open={open}
+        onClose={handleClose}
+        aria-labelledby="alert-dialog-title"
+        aria-describedby="alert-dialog-description"
+      >
+        <DialogTitle id="alert-dialog-title">
+          Comment utiliser cette interface
+        </DialogTitle>
+        <DialogContent sx={{ "& p": { marginBottom: 2 } }}>
+          <DialogContentText component="div" id="alert-dialog-description">
+            <Typography>
+              Avec les checkbox du haut, vous pouvez choisir entre traiter des
+              tableux de produit sans tableau nutritionel. Ou traiter des
+              produits pour lequels robotoof à trouver des nutriments en plus.
+            </Typography>
+            <Typography>
+              La date de la photo est affichée au dessus de la photo.
+            </Typography>
+            <Typography>
+              Les nutriments déjà associé au produit sont affiché en petit sous
+              les inputs.
+              <ol>
+                <li>
+                  En <span style={{ color: "green" }}>vert</span> pour ceux qui
+                  matchent avec la valeur du champ
+                </li>
+                <li>
+                  En <span style={{ color: "orange" }}>orange</span> si le champ
+                  est vide
+                </li>
+                <li>
+                  En <span style={{ color: "red" }}>rouge</span> si le champ est
+                  différent de la valeur connue.
+                </li>
+              </ol>
+              La valeur "-" indique une valeur abscente du tableau nutritionel.
+              Particulierement utile pour les fibres qui sont souvent abscente.
+            </Typography>
+            <Typography>
+              Quand une colone a été vérifiée (celle pour 100g ou celle par
+              portion) il ne vous reste plus qu'à la valider pour passer à la
+              suite. Innutil de remplir les deux colones. Une seul des deux peut
+              être enregistrée par OFF.
+            </Typography>
+
+            <ul>
+              <li>
+                Le bouton "skip" passe à la suite. quelqu'un d'autre s'en
+                chargera.
+              </li>
+              <li>
+                Le bouton "invalid image" indique que la photo ne correspond pas
+                à un tableau nutritionel, et supprime la question pour tout le
+                monde.
+              </li>
+            </ul>
+          </DialogContentText>
+        </DialogContent>
+        <DialogActions>
+          <Button onClick={handleClose} autoFocus>
+            Fermer
+          </Button>
+        </DialogActions>
+      </Dialog>
+    </React.Fragment>
+  );
+}
diff --git a/src/pages/nutrition/NutrimentCell.tsx b/src/pages/nutrition/NutrimentCell.tsx
index 696a37261..2168d85ea 100644
--- a/src/pages/nutrition/NutrimentCell.tsx
+++ b/src/pages/nutrition/NutrimentCell.tsx
@@ -14,6 +14,35 @@ interface NutrimentCellProps {
   setValues: (object) => void;
 }
 
+/**
+ * Returns the string value of the input without any space.
+ */
+function clean(input: undefined | string | null | number): string {
+  if (input == undefined) {
+    return "";
+  }
+  return `${input}`.replaceAll(" ", "");
+}
+function getLegendColor(product, prediction, nutrimentId) {
+  const cleanProduct = clean(product);
+  const cleanPrediction = clean(prediction);
+
+  console.log({ nutrimentId, cleanProduct, cleanPrediction });
+
+  if (cleanProduct === cleanPrediction) {
+    return "green";
+  }
+
+  if (cleanProduct === "" || cleanPrediction === "") {
+    return "orange";
+  }
+
+  if (cleanProduct !== cleanPrediction) {
+    return "red";
+  }
+  return undefined;
+}
+
 export const NutrimentCell = (props: NutrimentCellProps) => {
   const {
     nutrimentId,
@@ -64,17 +93,33 @@ export const NutrimentCell = (props: NutrimentCellProps) => {
         />
         <br />
         {displayOFFValue && (
-          <legend style={{ fontSize: 13, textAlign: "end" }}>
-            {productValue}
-            {productUnit}
+          <legend
+            style={{
+              fontSize: 13,
+              textAlign: "end",
+            }}
+          >
+            <span
+              style={{
+                color: getLegendColor(productValue, value, nutrimentId),
+              }}
+            >
+              {productValue}
+            </span>
+            <span
+              style={{
+                color: getLegendColor(productUnit, unit, nutrimentId),
+              }}
+            >
+              {productUnit}
+            </span>
           </legend>
         )}
       </div>
-
       {isValidUnit(unit) ? (
         <select
           style={{ width: 55 }}
-          value={unit}
+          value={unit || ""}
           tabIndex={tabIndex}
           onChange={(event) => {
             setValues((p) => ({
diff --git a/src/pages/nutrition/config.ts b/src/pages/nutrition/config.ts
index c998769a5..eff1c0075 100644
--- a/src/pages/nutrition/config.ts
+++ b/src/pages/nutrition/config.ts
@@ -1,14 +1,6 @@
 export const UNITS = ["", "g", "mg", "µg"];
 
-export const OFF_NUTRIMENTS_TO_IGNORE = [
-  "serving",
-  "energy", // Already available with energy kj and kcal.
-  "fruits-vegetables-legumes-estimate-from-ingredients",
-  "fruits-vegetables-nuts-estimate-from-ingredients",
-  "nova-group",
-  "nutrition-score-fr",
-];
-export const NUTRIMENTS_ORDER = [
+export const KNOWN_NUTRIMENTS = [
   // Energy
   "energy-kj",
   "energy-kcal",
@@ -104,10 +96,10 @@ export const NUTRIMENTS_ORDER = [
   "pantothenic-acid",
   "silica",
   "bicarbonate",
-  "Sulphate",
-  "Nitrate",
-  "Hydrogencarbonate",
-  "Nitrite",
+  "sulphate",
+  "nitrate",
+  "nydrogencarbonate",
+  "nitrite",
   "potassium",
   "chloride",
   "calcium",
diff --git a/src/pages/nutrition/index.tsx b/src/pages/nutrition/index.tsx
index 19a5228d1..592f1929b 100644
--- a/src/pages/nutrition/index.tsx
+++ b/src/pages/nutrition/index.tsx
@@ -15,12 +15,16 @@ import { ErrorBoundary } from "../taxonomyWalk/Error";
 import LinksToProduct from "./LinksToProduct";
 import { NutrimentCell } from "./NutrimentCell";
 import PictureSection from "./PictureSection";
-import { NUTRIMENTS_ORDER } from "./config";
+import { KNOWN_NUTRIMENTS } from "./config";
+import Instructions from "./Instructions";
 
 export default function Nutrition() {
   const [partiallyFilled, setPartiallyFilled] = React.useState(false);
   const [displayOFFValue, setDisplayOFFValue] = React.useState(false);
-  const handlePartiallyFilled = (_, checked) => setPartiallyFilled(checked);
+  const handlePartiallyFilled = (_, checked) => {
+    setPartiallyFilled(checked);
+    setDisplayOFFValue(checked);
+  };
   const handleDisplayOFFValue = (_, checked) => setDisplayOFFValue(checked);
 
   const [additionalIds, setAdditionalIds] = React.useState([]);
@@ -65,18 +69,19 @@ export default function Nutrition() {
     }));
   }, [insight]);
 
-  const nutrimentsDetected = React.useMemo(
+  const nutrimentsDisplayed = React.useMemo(
     () => structurePredictions(values, product, additionalIds),
     [values, product, additionalIds],
   );
 
   const notUsedNutriments = React.useMemo(
-    () => NUTRIMENTS_ORDER.filter((id) => !nutrimentsDetected.includes(id)),
-    [nutrimentsDetected],
+    () => KNOWN_NUTRIMENTS.filter((id) => !nutrimentsDisplayed.includes(id)),
+    [nutrimentsDisplayed],
   );
   return (
     <React.Suspense>
       <ErrorBoundary>
+        <Instructions />
         <Stack direction="row">
           <Box sx={{ width: "50%" }}>
             <PictureSection
@@ -157,7 +162,7 @@ export default function Nutrition() {
                   </tr>
                 </thead>
                 <tbody>
-                  {nutrimentsDetected.map((nutrimentId) => {
+                  {nutrimentsDisplayed.map((nutrimentId) => {
                     const key100g = `${nutrimentId}_100g`;
                     const { value: value100g, unit: unit100g } =
                       values[key100g] ?? {};
@@ -215,7 +220,7 @@ export default function Nutrition() {
                           setAdditionalIds((p) => [...p, event.target.value]);
                         }}
                       >
-                        <option disabled selected value="">
+                        <option disabled value="">
                           -- add nutriment --
                         </option>
                         {notUsedNutriments.map((nutriId) => (
diff --git a/src/pages/nutrition/utils.ts b/src/pages/nutrition/utils.ts
index e4f919e78..98a6288ed 100644
--- a/src/pages/nutrition/utils.ts
+++ b/src/pages/nutrition/utils.ts
@@ -1,5 +1,5 @@
 import axios from "axios";
-import { OFF_NUTRIMENTS_TO_IGNORE, UNITS } from "./config";
+import { KNOWN_NUTRIMENTS, UNITS } from "./config";
 import { NutrimentPrediction } from "./insight.types";
 import { ROBOTOFF_API_URL } from "../../const";
 
@@ -32,7 +32,7 @@ export function structurePredictions(
   Object.keys(predictions).forEach((key) => {
     const id = key.split("_")[0]; // split 'energy-kj_100g' to only get 'energy-kj'
 
-    if (OFF_NUTRIMENTS_TO_IGNORE.includes(id)) {
+    if (!KNOWN_NUTRIMENTS.includes(id)) {
       return;
     }
     if (!nurimentsIds.includes(id)) {
@@ -43,7 +43,7 @@ export function structurePredictions(
   Object.keys(productValue?.nutriments ?? {}).forEach((key) => {
     const id = key.split("_")[0]; // split 'energy-kj_100g' to only get 'energy-kj'
 
-    if (OFF_NUTRIMENTS_TO_IGNORE.includes(id)) {
+    if (!KNOWN_NUTRIMENTS.includes(id)) {
       return;
     }
     if (!nurimentsIds.includes(id)) {
diff --git a/update-countries.js b/update-countries.js
index a1a75c1f2..0d386a96e 100644
--- a/update-countries.js
+++ b/update-countries.js
@@ -7,20 +7,28 @@ axios("https://static.openfoodfacts.org/data/taxonomies/countries.json")
       "./src/assets/countries.json",
       JSON.stringify(
         Object.entries(data)
-          .map(([key, value]) => ({
-            id: key,
-            label: value.name.en,
-            languageCode:
+          .map(([key, value]) => {
+            let countryCode =
+              value.country_code_2 === undefined
+                ? undefined
+                : value.country_code_2.en.toLowerCase();
+            if (countryCode === "world") {
+              countryCode = "";
+            }
+
+            const languageCode =
               value.languages === undefined
                 ? "en"
                 : value.languages.en === undefined
                 ? undefined
-                : value.languages.en.split(",")[0],
-            countryCode:
-              value.country_code_2 === undefined
-                ? undefined
-                : value.country_code_2.en.toLowerCase(),
-          }))
+                : value.languages.en.split(",")[0];
+            return {
+              id: key,
+              label: value.name.en,
+              languageCode,
+              countryCode,
+            };
+          })
           .filter((country) => country.countryCode !== undefined)
           .sort((a, b) => a.label.localeCompare(b.label)),
       ),